Chapter III: Preface (3)

Tit-tle, _tip_, _tib_, _tipyn_

Toad-stool, _madalch_, _madarch_

Toi-let, _bwrdd ymdrwsio_

Toil-some, _llafurus_, _trafferthus_

To-ken, _arwydd_, _argoel_: _arwyddo_

Tomb-stone, _beddfaen_, _careg bedd_

Ton-ic, _tonawl_; _hydwyth_, _ardwythol_

Tooth-ache, _deintwst_, _dannodd_

To-phet, _offrymfa_; _uffern_

Top-ic, _testun_, _pwngc_, _pen_

Top-most, _uchaf_, _penaf_, _prif_

Tor-ment, _poen_, _gofid_: _poeni_, _blino_

Tor-rent, _ffrwd_, _ffrydlif_; _ffrwdlifol_

Tor-rid, _poeth_, _crasboeth_

Tor-toise, _crwban_

Tor-ture, _poen_, _penyd_: _poeni_

To-tal, _y cwbl_; _cwbl_, _cyfan_, _llwyr_

Touch-ing, _cynhyrfiol_; _am_, _o ran_, _mewn perthynas_

To-ward, _hydrin_, _hwylus_; _tueddol_

To-wards, _tua_, _tuag at_, _a_, _at_

Tow-el, _llawliain_, _lliain ymsychu_

Tow-er, _twr_, _caerfa_: _ymnoddi_; _esgyn_

Town-clerk, _trefysgrifenydd_

Town-hall, _llysdy tref_

Town-ship, _trefgordd_

Towns-man, _trefwr_, _cyttrefwr_

Track-less, _di-ôl_, _disathr_, _dilwybr_

Trac-tion, _hydyniad_, _estyniad_

Tra-duce, _gwaradwyddo_, _goganu_

Traf-fic, _marchnadaeth_: _masnachu_

Trai-tor, _bradwr_, _bradychwr_

Tram-ple, _mysangu_, _sathru_

Tran-quil, _tawel_, _llonydd_

Trans-act, _trin_, _trefnu_, _gwneuthur_

Tran-scend, _trarhagori_, _blaenori_

Tran-scribe, _adysgrifo_; _adysgrifenu_

Trans-fer, _trosglwyddiad_, _trosiad_: _trosglwyddo_

Trans-fix, _trywanu_, _gwanu_

Trans-form, _dullnewidio_

Trans-gress, _camweddu_, _troseddu_

Tran-sient, _diflanedig_, _ffoawl_

Tran-sit, _trawsfud_, _trawdd_

Trans-late, _cyfieithu_, _trosglwyddo_

Trans-mit, _anfon at_, _trosglwyddo_

Trans-pire, _dynoddi_, _dyfod i glyw_

Trans-plant, _ailblannu_, _adblannu_

Trans-port, _gorawen_; _trosglwyddlong_: _trosglwyddo_, _alltudio_

Trans-pose, _trawsddodi_, _trawsosod_

Trans-verse, _croes_, _traws_

Trap-pings, _seirch_, _addurnau meirch_

Trap-door, _brad-ddrws_, _drws codi_

Trav-ail, _llafur_, _gwewyr esgor_: _trafaelu_, _ymboeni_

Trav-el, _taith_, _ymdaith_; _teithio_

Trav-erse, _cwyn_; _gwrthdro_; _ymgroes_: _trawsymdeithio_

Trea-cle, _triagl_

Trea-son, _brad_, _bradwriaeth_

Treas-ure, _trysor_: _trysori_

Treat-ise, _traethawd_, _traith_

Treat-ment, _triniaeth_, _triniad_

Treat-y, _cynnadledd_, _cytundeb_

Treb-le, _meinllais_; _tridyblyg_: _tridyblygu_

Trel-lis, _delltwaith_, _cledrwaith_

Trem-ble, _crynu_, _arswydu_

Trem-our, _crydiant_; _crynfa_; _dychryn_

Trench-er, _prenddysgl_

Tres-pass, _trosedd_, _camwedd_: _troseddu_

Tri-al, _prawf_, _profiad_, _profedigaeth_

Trib-une, _swyddog Rhufeinig_; _cyssul_

Trib-ute, _teyrnged_, _treth_

Tri-fle, _ychydigyn_: _ofera_, _segura_

Tri-fling, _anoberedd_; _diwerth_, _gwael_

Trig-ger, _ystordyn_; _cloig_; _clicied_

Trim-ming, _addurn_, _trwsiad_

Tri-umph, _gorfoledd_, _buddugoliaeth_: _gorfoleddu_, _buddugoliaethu_

Troop-er, _marchfilwr_, _marchogwr_

Tro-phy, _arwydd buddugoliaeth_

Trop-ic, _trofan_, _trofa_

Troub-le, _blinder_, _gofid_: _blino_, _poeni_

Trow-el, _llwyarn_: _llwyarnu_

Tru-ant, _godechwr_, _llechwr_; _segurllyd_

Tru-ly, _yn wir_, _yn ddiau_, _yn gywir_

Trum-pet, _udgorn_: _udganu_

Trus-tee, _ymddiriedolwr_, _gwarchodwr_

Try-ing, _profedigaethus_

Tues-day, _dydd Mawrth_

Tug-boat, _llusglong_, _llusg-gwch_

Tum-ble, _codwm_: _codymu_

Tu-mid, _chwyddig_, _llawn chwydd_

Tu-mult, _terfysg_: _codi terfysg_, _cynhyrfu_

Tun-nage, _tunelliad_; _tunelldoll_

Tun-nel, _ffynel_; _tryffordd_: _trydyllu_

Tur-ban, _pendorch_, _penamdorch_

Tur-bid, _afloyw_, _cymmysglyd_, _tew_

Turn-ing, _tröad_, _chweliad_; _turniad_

Tur-nip, _erfinen_, _meipen_

Turn-key, _allweddwas_, _cloadydd_

Turn-pike, _ffordd-dollfa_, _tollborth_

Tur-ret, _twr bychan_, _twryn_

Tur-tle, _crwban_

Tu-tor, _ymgeleddwr_, _athraw_: _addysgu_

Twen-ty, _ugain_

Twi-light, _cyflychwyr_, _cyfnos_; _cyfnosawl_

Twin-kle, _amrantiad_; _ysmig_: _ysmician_

Twink-ling, _gwreichioniad_, _amrantiad_

Two-fold, _dauddyblyg_, _dyblyg_

Ty-rant, _gormesdeyrn_, _gorthrymwr_

Ud-der, _piw_, _cader_; _pwrs_

Ug-ly, _hagr_, _gwrthun_, _hyll_

Ul-cer, _gôr_, _gorfa_, _llynoryn_

Um-pire, _dyddiwr_, _canolwr_

Un-apt, _anaddas_; _diawch_, _diaws_

Un-bar, _dadfolltio_, _dadfario_

Un-bend, _dadblygu_

Un-bound, _afrwym_, _dirwym_, _rhydd_

Un-bred, _anhyddysg_, _diddysg_, _difoes_

Un-cle, _ewythr_, _ewythyr_

Un-clean, _aflan_, _budr_, _brwnt_

Unc-tion, _eneiniad_

Un-der, _dan_, _tan_, _oddi tan_, _is_; _tanodd_

Un-do, _dadwneud_; _dattod_; _dyfetha_

Un-done, _dadwneuthuredig_

Un-dress, _amwisg_: _dadwisgo_, _diosg_

Un-fair, _annheg_, _anonest_

Un-fed, _anmhesgedig_

Un-fit, _anghymwys_: _anghymwyso_

Un-fold, _agor_, _egluro_; _dadblygu_

Un-hook, _dadfachu_, _difachu_

U-nit, _un_, _y rhif un_

U-nite, _uno_, _cyduno_, _cydio_

Un-just, _anghyfiawn_, _annheg_

Un-kind, _angharedig_, _annhirion_

Un-known, _anadnabyddus_

Un-less, _oni_, _onid_, _oddi eithr_; _os na_

Un-like, _annhebyg_, _anghyffelyb_

Un-load, _dadlwytho_

Un-lock, _dadgloi_, _agor clo_

Un-loose, _gollwng_, _rhyddhau_

Un-pack, _dadsypynio_

Un-paid, _annhaledig_, _heb ei dalu_

Un-roof, _didoi_, _tynu to_

Un-root, _dadwreiddio_, _diwreiddio_

Un-seen, _anweledig_, _cudd_

Un-sold, _anwerthedig_, _heb ei werthu_

Un-sound, _afiachus_, _llygredig_

Un-tie, _dadglymu_, _datod_

Un-til, _hyd at_, _hyd oni_, _nes_

Un-to, _i_, _at_, _hyd_, _hyd at_, _wrth_

Un-wise, _annoeth_, _anghall_

Un-yoke, _dadieuo_, _di-ieuo_

Up-braid, _dannod_, _edliw_

Up-hold, _dal i fyny_, _cynnal_

Up-most, _uchaf_, _uchelaf_

Up-on, _ar_, _ar uchaf_, _ar warthaf_

Up-per, _uch_, _uwch_

Up-right, _syth_, _uniawn_, _cyfiawn_

Up-roar, _terfysg_, _cynhwrf_

Up-ward, _uwchlaw_; _i fyny_

Ur-chin, _draenog_, _draened_

Ur-gent, _cymhelliadol_, _annogol_

Us-age, _arfer_, _defod_, _arferiad_; _triniaeth_

Us-ance, _llôg_, _ocr_; _gwasanaeth arian_

Use-ful, _gwasanaethgar_, _buddiol_

Use-less, _diddefnydd_, _difudd_

Ush-er, _isddysgawdwr_; _rhingyll_

U-surp, _trawsfeddiannu_, _camoresgyn_

Ut-most, _eithaf_, _pellaf_

Ut-ter, _eithaf_; _hollol_: _yngan_, _adrodd_

Va-cant, _gwag_, _rhydd_; _didrafferth_

Va-cate, _gwaghau_, _ymadael a_

Va-grant, _gwibiad_, _crwydryn_; _crwydraidd_

Val-ance, _cylchedlen gwely_

Val-et, _gweinydd_, _ystafellwas_

Val-iance, _dewredd_, _gwrolder_

Val-iant, _dewr_, _calonog_

Val-ley, _diffryn_, _gwastadedd_

Val-our, _dewrder_, _gwroldeb_

Val-ue, _gwerth_, _pris_: _prisio_; _gwerthfawrogi_

Van-guard, _blaenfyddin_, _blaenres_

Van-ish, _diflanu_, _darfod_

Van-quish, _darostwng_, _gorchfygu_

Va-pour, _tawch_, _tarth_, _ager_: _tarthio_

Var-nish, _adliw_, _claerlyn_: _adlywio_, _dyloywi_

Va-ry, _newid_, _newidiad_: _amrywio_, _newid_; _anghytuno_

Vast-ly, _yn ddirfawr_, _yn orfawr_

Vend-er, _gwerthwr_, _arwerthwr_

Ven-geance, _dial_, _dialedd_

Venge-ful, _dialeddgar_, _dialfawr_

Ven-om, _gwenwyn_

Ven-ture, _antur_, _anturiaeth_: _anturio_

Ve-nus, _Gwener_; _y seren Gwener_

Ver-bal, _parwyddol_, _berfol_; _geiriol_

Ver-dant, _gwyrdd_, _gwyrddlas_

Ver-dict, _dedfryd_, _barn_

Ver-dure, _gwyrddni_, _gwyrddedd_

Ver-mine, _pryf_, _pryfyn_

Ver-nal, _gwanwynol_

Ver-sion, _cyfieithiad_

Ver-tex, _pen uchaf_, _copa_, _top_, _uchedd_

Ver-y, _gwir_, _yr un_; _dros ben_, _tra_, _yn gwbl_, _yn dra_

Ves-sel, _llestr_; _dodrefnyn_: _llestru_

Ves-tige, _ol_, _ol troed_, _olrhe_

Ves-try, _gwisgfa_; _cyfarfod plwyfol_

Ves-ture, _gwisg_, _arwisg_; _dillad_

Vi-al, _costrelan_: _costrelu_

Vi-brate, _crynu_, _crydu_, _ysgwyd_

Vic-ar, _periglor_, _uchberiglor_

Vice-roy, _rhagfrenin_, _rhagdeyrn_

Vi-cious, _drygionus_, _gwydus_

Vic-tim, _aberth_; _ysglyfaeth_

Vict-uals, _lluniaeth_, _bwyd_

Vig-our, _grym_, _nerth_; _egni_

Vil-lage, _pentref_, _maesdref_, _llan_

Vil-lain, _adyn_; _caethddeiliad_; _taëog_

Vine-yard, _gwinllan_

Vin-tage, _casgliad grawnwin_; _gwinaeth_

Vi-per, _gwiber_; _neidr_

Vir-gin, _gwyryf_, _morwyn_; _dihalog_

Vir-tue, _rhin_, _rhinwedd_; _effaith_

Vis-age, _gwyneb_, _gwynebpryd_

Vis-count, _coriarll_, _isiarll_

Vis-ion, _gweledigaeth_, _gweled_

Vis-it, _ymweliad_: _ymweled_

Vi-tal, _bywiol_, _bywydol_

Vi-tals, _bywydolion_, _rhanau bywydol_

Vi-vid, _bywiog_, _llawn byw_, _heinyf_

Vo-cal, _llefarawg_; _lleisiol_, _seiniol_

Vol-ley, _crochruthr_: _taflu allan_, _gollwng allan_

Vol-ume, _claing_, _cyfrol_, _cyflyfr_

Vom-it, _chwyd_, _cyfog_: _chwydu_, _cyfogi_

Vor-tex, _trobwll_, _pwll tro_; _trowynt_

Vouch-er, _prawfysgrif_; _ardystiwr_

Vouch-safe, _teilyngu_, _bod yn wiw_; _cydsynio_

Vow-el, _llafarai_, _llafariad_

Voy-age, _mordaith_: _mordeithio_

Vul-gar, _gwerin_, _y cyffredin_; _cyffredin_; _difoes_, _isel_, _gwael_

Vul-ture, _rheibogydd_, _gwangciedydd_

Wad-ding, _sechddefnydd_, _llacdenlli_

Wad-ing, _rhydiad_; _treiddiad_

Wa-fer, _llethen_, _teisenig_

Wa-ges, _cyflog_, _hur_, _llog_

Wain-scot, _parwydwaith coed_: _parwydfyrddio_

Wait-er, _dysgwyliwr_; _gweitiwr_

Walk-ing, _cerddediad_, _rhodiad_

Wal-let, _ysgrepan_, _cwd deuben_

Wal-low, _ymdreigl_, _ymdro_: _ymdreiglo_

Wal-nut, _cneuen ffreinig_

Wan-der, _crwydro_, _gwibio_

Want-ing, _diffygiol_, _mewn eisiau o_

Wan-ton, _anllad-ddyn_, _anlladferch_: _anlladu_; _anllad_

War-ble, _crychleisio_, _mwynbyngcio_

War-den, _gwarcheidwr_

Ward-robe, _gwisgfa_, _dilladfa_

Ware-house, _ystordy_, _ystorfa_

War-fare, _milwriaeth_: _milwrio_

War-like, _rhyfelgar_, _milwrol_

Warn-ing, _rhybudd_, _rhybuddiad_

War-rant, _gwarant_: _gwarantu_

War-ren, _cwning-gaer_

Wash-ing, _golchiad_; _ymolchiad_

Waste-book, _nodlyfr_, _llawlyfr_

Waste-ful, _afradus_, _gwastraffus_

Watch-ful, _gwyliadwrus_

Watch-ing, _gwyliad_, _gwyliadwriaeth_

Wa-ter, _dwfr_, _dwr_: _dyfrhau_, _dyfrio_

Wat-tles, _tagellau_; _gwiail_

Wav-ing, _chwyfiad_; _bwhwmaniad_

Way-lay, _cynllwyn_, _cynllwyno_

Way-ward, _afrywiog_, _cyndyn_

Weak-en, _gwanhau_, _gwanychu_

Weak-ness, _gwendid_, _llesgedd_

Wealth-y, _cyfoethog_, _goludog_

Wean-ing, _diddyfniad_

Weap-on, _arf_, _erfyn_, _offeryn_

Wea-ry, _diffygiol_, _lluddedig_: _blino_

Wea-sel, _bronwen_, _gwenci_

Weath-er, _tywydd_, _hin_: _dal_; _gwrthsefyll_

Weav-ing, _gwead_, _gweuad_

Wed-ding, _priodas_; _neithior_

Week-ly, _wythnosol_

Weight-y, _pwysfawr_, _trwm_

Wel-come, _croesaw_; _croesawedig_: _croesawu_

Wel-fare, _llwydd_, _llwyddiant_; _iechyd_; _lles_

Well-done, _da_, _da iawn_, _puriawn_

Welsh-man, _Cymro_, _Brython_

West-ward, _tu a'r gorllewin_, _i'r gorllewin_

Weth-er, _mollt_, _llwdn dafad_

Where-as, _can_, _gan_; _cyd_

Where-at, _wrth yr hyn_

Where-by, _trwy yr hyn_

Where-fore, _am ba achos_, _paham_, _o herwydd_

Where-of, _o'r hyn_, _o ba beth_

Where-in, _yn yr hyn_, _yn yr hwn_

Where-on, _ar yr hyn_, _ar hyny_, _ar ba beth_

Where-to, _i ba le_

Where-with, _a'r hyn_, _a pha beth_, _gyda'r hyn_; _trwy yr hyn_

Wheth-er, _pa un_, _pa un ai_

Whet-stone, _hogal_, _hogalen_

Whet-ting, _hogiad_, _awchlymiad_

Whirl-pool, _llyn tro_, _pwll tro_

Whirl-wind, _trowynt_, _corwynt_

Whis-per, _sygan_, _sibrwd_: _sisialu_

Whis-tle, _chwib_, _chwibanogl_: _chwibanu_

White-ness, _can_, _gwyndra_

White-wash, _gwyngalch_: _gwyngalchu_

Whith-er, _i ba le_, _i ba fan_

Whole-sale, _cyfanwerth_; _cyfanwerthol_

Whole-some, _iach_, _iachus_

Whol-ly, _yn hollol_, _yn gwbl_

Whore-dom, _puteindra_

Wick-ed, _drwg_, _drygionus_

Wid-ow, _gweddw_; _unig_

Wild-ness, _gwylltineb_; _gorphwyll_

Wil-ful, _gwirfoddol_, _bwriadol_

Will-ing, _ewyllysiad_; _ewyllysgar_

Wil-low, _helygen_

Wind-bound, _caeth gan wynt_

Wind-lass, _dyrwynlath_

Win-dow, _ffenestr_, _alches_

Win-now, _nithio_, _gwyntyllio_

Win-ter, _gauaf_: _gauafu_

Wis-dom, _doethineb_, _callineb_

Wise-ly, _yn ddoeth_, _yn synwyrol_

Witch-craft, _dewiniaeth_

With-al, _hefyd_, _heblaw hyny_

With-draw, _cilio_, _encilio_, _neillduo_, _tynu yn ol_

With-er, _gwywo_, _crino_

With-hold, _attal_, _dal_, _rhwystro_

With-in, _oddi fewn_, _ofewn_

With-out, _heb_; _oddi eithr_; _tu allan_

With-stand, _gwrthsefyll_, _gwrthwynebu_

Wit-ness, _tyst_, _tystiolaeth_: _tystio_

Wit-ty, _synwyrol_, _ffraeth_

Wiz-ard, _cynghallen_, _dewin_

Wo-ful, _gofidus_, _gresynol_

Wom-an, _gwraig_, _benyw_

Won-der, _rhyfeddod_, _syndod_: _rhyfeddu_, _synu_

Wood-bine, _gwyddfid_

Wood-cock, _cyffylog_

Wood-en, _coedawl_, _o bren_

Wood-y, _coedog_, _llawn coed_

Word-ing, _geiriad_

Work-house, _gweithdy_

Work-man, _gweithiwr_, _gweithydd_

World-ly, _bydol_, _bydgarol_

Wor-ship, _iolaeth_, _addoliad_: _ioli_, _addoli_

Wor-thy, _teilwng_; _gwiw_, _addas_

Wound-ed, _archolledig_, _briwedig_

Wound-ing, _archolliad_, _clwyfiad_

Wran-gle, _cecri_, _ymgecru_: _cecru_

Wrap-per, _amdrws_, _amdwyg_

Wres-tle, _ymaflyd_, _ymafael_

Wretch-ed, _truan_, _gresynus_

Wrin-kle, _crych_: _crychu_

Writ-ing, _ysgrifen_, _ysgrifeniad_

Writ-ten, _ysgrifenedig_

Year-ling, _blwyddiad_, _llwdn blwydd_

Year-ly, _blwyddol_; _yn flynyddol_

Yel-low, _melyn_

Yeo-man, _rhydd-ddeiliad_; _gosgorddwr_

Yield-ing, _yn dwyn_; _yn caniatau_

Young-ster, _ieuangyn_, _llencyn_

Your-self, _eich hun_, _eich hunan_

Your-selves, _eich hunain_, _chwychwi_

Zeal-ous, _aiddgar_, _eiddigeddus_, _gwresog_

Zen-ith, _uwchben_, _entrych nen_

Zig-zag, _igam ogam_

WORDS OF THREE SYLLABLES.

A-ban-don, _gadael_; _gwrthod_, _rhoi i fyny_

A-base-ment, _gostyngiad_; _iseliad_

A-bate-ment, _lleihâd_, _toliant_; _cwymp_

Ab-di-cate, _gadu_, _gwrthod_; _rhoi i fyny_

A-bet-tor, _annogwr_, _cynneilydd_

Ab-hor-rence, _ffieiddiad_; _casineb_, _atgasrwydd_

Ab-hor-rent, _ffiaidd_, _cas_; _atgas_

A-bol-ish, _dirymu_; _diddymu_, _dilëu_

A-bound-ing, _llawnder_, _amledd_, _digonedd_

A-bridge-ment, _talfyriad_, _byrhâd_; _crynodeb_

Ab-ro-gate, _diddymu_, _dilëu_; _dirymu_

Ab-rupt-ly, _yn fyrbwyll_; _yn sydyn_

Ab-sen-tee, _absennolwr_; _ymabsennolwr_

Ab-so-lute, _arbenig_; _hollol_, _cwbl_

Ab-sti-nence, _ymattaliad_, _ymarbediad_

Ab-sti-nent, _ymattaliol_, _ymwrthodol_

Ab-stract-ed, _dansoddedig_; _neillduedig_

A-bun-dance, _helaethrwdd_, _llawnder_, _amledd_

A-bun-dant, _helaeth_; _llawn_; _toreithiog_

A-bu-sive, _difrïol_, _sarhäus_, _trahäus_

Ac-cept-ance, _derbyniad_; _croesaw_; _addefeb_

Ac-ci-dence, _rhagieithadur_; _egwyddoreg_

Ac-ci-dent, _damwain_, _dygwydd_; _hap_

Ac-com-plice, _cyfranogwr_, _rhanogydd_

Ac-com-plish, _cyflawni_, _cwblhau_; _gwneuthur_

Ac-cord-ance, _cydfod_, _cydweddiad_

Ac-cord-ant, _cytunol_, _unweddol_; _cyfatebol_

Ac-cord-ing, _yn ol_; _yn gyffelyb_; _megis_, _fel_

Ac-count-ant, _cyfrifwr_, _cyfrifydd_

Ac-cu-rate, _cywir_; _cywraint_; _manwl_

Ac-cus-tom, _arfer_, _arferu_; _ymarfer_

A-chieve-ment, _cyflawniad_; _gorchest_

Ac-know-ledge, _cydnabod_; _cyfaddef_

Ac-quaint-ance, _cydnabyddiaeth_; _cydnabod_, _cyfaill_

Ac-quaint-ed, _cydnabyddus_; _cynnefin_

Ac-qui-esce, _ymfoddloni_; _cydsynio_, _ymostwng_

Ac-quire-ment, _cyrhaeddiad_; _ymgais_

Ac-quit-tance, _gollyngdod_; _derbyneb_

Ac-tive-ly, _yn weithredol_; _yn fywiog_

Ac-tu-al, _gweithredol_; _gwir_

A-cute-ly, _yn llymacenol_: _yn llym_

Ad-dict-ed, _ymroddedig_; _chwannog_

Ad-di-tion, _chwanegiad_; _cynnodiaeth_

Ad-e-quate, _cyfartal_; _digonol_: _gordebygu_

Ad-her-ent, _ymlynwr_, _dylynwr_; _ymlynol_

Ad-he-sion, _ymlyniad_, _glyniad_; _undeb_

Ad-he-sive, _ymlynol_; _gludiol_

Ad-ja-cent, _agos_, _cyffiniol_, _ger llaw_

Ad-jec-tive, _ansoddair_, _adenw_

Ad-join-ing, _wrth_, _yn ymyl_; _yn cydio_

Ad-journ-ment, _addoediad_, _gohiriad_

Ad-just-ing, _trefniad_, _addasiad_

Ad-mi-ral, _llyngesor_, _llyngesydd_

Ad-mis-sion, _derbyniad_; _goddefiad_; _caniatâd_

Ad-mit-tance, _derbyniad_; _goddefiad_; _addefiad_

Ad-mon-ish, _rhybuddio_; _cynghori_; _ceryddu_

A-dop-tion, _mabwysiad_; _dewisiad_

Ad-vance-ment, _cychwyniad_; _dyrchafiad_

Ad-van-tage, _budd_, _mantais_; _ennill_; _goruchafiaeth_: _buddioli_, _manteisio_

Ad-ven-ture, _antur_; _beiddiad_: _anturio_; _beiddio_

Ad-ver-tise, _hysbysu_, _cyhoeddi_, _amlygu_

Ad-vo-cate, _dadleuwr_; _amddiffynwr_; _eiriolwr_: _dadleu_; _amddiffyn_

Af-fa-ble, _mwyn_, _hynaws_, _mwynaidd_

Af-fec-tion, _serch_; _hoffedd_, _anwyldeb_

Af-fi-ance, _ymddiried_; _ymddiried_, _hyderu_

Af-flic-tion, _cystudd_, _adfyd_; _gorthrymder_

Af-flu-ence, _llawnder_, _llawndid_, _amledd_

Af-flu-ent, _llawn_, _gorlawn_; _cyfoethog_

A-fore-hand, _ym mlaen llaw_

A-fore-said, _rhagddywededig_, _crybwylledig_

Af-ter-noon, _prydnawn_, _prynawn_

Af-ter-ward, Af-ter-wards, _gwedi_, _wedi_, _wedi hyny_; _ar ôl hyny_

Ag-gran-dize, _dyrchafu_, _anrhydeddu_

Ag-gra-vate, _mwyhau_; _gwaethygu_; _blino_

Ag-gre-gate, _cynnulliad_; _cyf-fanswm_: _cynnull_, _crynhoi_

Ag-gres-sion, _cynhen_; _cynymrafael_

Ag-i-tate, _cynhyrfu_; _terfysgu_

Ag-o-ny, _dirboen_, _ing_; _gorymdrech_

A-gree-ment, _undeb_, _cytundeb_; _ammod_

A-larm-ing, _alarmus_; _arswydus_

Al-der-man, _henadur_; _ynad_

Al-ge-bra, _alsoddeg_, _alsawdd_

Al-ien-ate, _estronoli_, _trosglwyddo_; _cilio_

Al-i-ment, _maeth_, _lluniaeth_, _ymborth_

Al-i-quot, _cydrifol_, _cyfnifer_

Al-le-giance, _gwarogaeth_, _teyrngarwch_

Al-li-ance, _cyfathrach_; _cydbleidiaeth_

Al-lot-ment, _cyfran_, _darn_, _dyraniad_

Al-low-ance, _caniatâd_; _addefiad_; _lleihâd_

Al-lu-sion, _cyfeiriad_, _crybwylliad_

Al-migh-ty, _yr Hollalluog_; _ollalluog_

Al-pha-bet, _egwyddor_; _y llythrenau_

Al-read-y, _eisoes_; _yn barod_, _hyd yn hyn_

Al-ter-nate, _cylchynol_: _cylchnewid_

Al-ti-tude, _uchder_, _uchelder_

Am-bi-tion, _uchelgais_, _uchelfryd_

Am-bi-tious, _uchelgeisiol_, _uchelfrydig_

Am-bus-cade, _cynllwyn_, _llechfa_: _cadlechu_

A-mend-ment, _cyweiriad_; _gwelliant_

Am-nes-ty, _ebargofraith_, _tellwedd_

Am-pli-tude, _helaethrwydd_, _eangder_

Am-pu-tate, _amdori_, _tori aelod_

A-muse-ment, _difyrwch_, _digrifwch_

An-a-lyse, _dosranu_; _dosbarthu_

An-ar-chy, _aflywodraeth_; _terfysg_

An-ces-tors, _hynafiaid_; _cyndadau_

An-chor-age, _angorfa_, _angordraeth_

An-ec-dote, _hanesyn_, _cofhanesyn_

An-gu-lar, _onglog_, _conglog_

An-i-mal, _anifel_, _anifail_; _anifeilig_

An-i-mate, _byw_, _bywiog_: _bywhau_; _cefnogi_

An-noy-ance, _blinder_, _aflonyddwch_

An-nu-al, _blwyddiadur_; _blynyddol_

An-nu-lar, _modrwyol_, _cylchol_

An-oth-er, _arall_, _all_; _un arall_

An-ti-christ, _anghrist_, _gwrthgrist_

An-ti-dote, _gwrthwenwyn_, _dadwenwyn_

A-part-ment, _rhandy_, _ystafell_

Ap-a-thy, _annheimlad_; _difaterwch_

Ap-er-ture, _agoriad_, _adwy_, _bwlch_

A-pos-tate, _gwrthgiliwr_; _gwrthgiliol_

A-pos-tle, _apostol_; _anfonog_

Ap-pa-rel, _dillad_, _gwisg_: _dilladu_, _gwisgo_

Ap-pa-rent, _amlwg_, _eglur_; _ymddangosiadol_

Ap-pear-ance, _ymddangosiad_, _golwg_; _gweledigaeth_

Ap-pend-age, _dibynai_; _attodiad_, _chwanegiad_

Ap-pen-dix, _attodiad_, _ychwanegiad_

Ap-per-tain, _perthyn_, _perthynu_

Ap-pe-tite, _chwant_, _gwangc_, _chwant bwyd_

Ap-point-ment, _penodiad_, _gosodiad_; _ammod_

Ap-prais-er, _prisiwr_, _prisiedydd_

Ap-pre-hend, _amgyffred_, _dirnad_; _tybio_

Ap-prov-al, _cymmeradwyaeth_; _tystiad_

A-quat-ic, _dyfrol_, _dyfrog_

Aq-ue-duct, _awell_; _gwyffos_, _dyfrffos_

Ar-a-ble, _arodol_; _arddadwy_

Ar-bi-ter, _canolwr_; _barnydd_

Arch-an-gel, _archangel_

Arch-bish-op, _archesgob_

Ar-chi-tect, _adeiladydd_, _pensaer_; _saer_

Ar-den-cy, _angerdd_; _gwres_; _taerni_

Ar-du-ous, _dyrys_, _anhawdd_; _caled_

Ar-gu-ment, _rheswm_, _dadl_; _testyn_

Ar-mo-ry, _arfdy_; _rhyfelwisg_; _pais arfau_

Ar-range-ment, _trefniad_; _rhestriad_

Ar-ro-gance, _traha_, _hunandyb_; _rhyfyg_

Ar-ro-gant, _trahaus_, _amryfus_, _hunanol_

Ar-se-nal, _arfdy_, _ystordy arfau_

Ar-te-ry, _rhedweli_, _arwythen_

Ar-ti-cle, _erthygl_; _bannod_: _bannodi_

Ar-ti-fice, _cyfrwyswaith_, _dichell_, _ystryw_

As-cen-sion, _esgyniad_, _dyrchafiad_

As-cer-tain, _gwirio_, _sicrhau_; _sefydlu_

As-pi-rate, _chwernsain_: _chwernseinio_

As-sas-sin, _murnwr_; _bradlofrudd_

As-sem-ble, _cynnull_, _casglu_; _ymgynnull_

As-sem-bly, _cynnullfa_, _cynnulleidfa_

As-ser-tion, _honiad_, _haeriad_, _cadarnhâd_

As-sess-ment, _trethiad_; _ardrethiad_

As-sign-ee, _daerodydd_, _dirprwywr_

As-sign-ment, _daerodiad_, _trosglwyddiad_

As-sist-ance, _cynnorthwy_, _cymhorth_

As-sist-ant, _cynnorthwywr_; _cynnorthwyol_

As-sort-ment, _cymmmathiad_; _pigion_

As-sump-tion, _cymmeriant_; _rhyfyg_

As-sur-ance, _dilysrwydd_, _sicrwydd_; _hyder_

As-ter-isk, _serenig_ (*)

As-ton-ish, _synu_, _brawychu_; _rhyfeddu_

A-sun-der, _o'r neilldu_, _ar wahan_

A-sy-lum, _noddfa_, _achlesfa_

A-the-ist, _annuwiad_, _atheist_

At-mo-sphere, _awyrgylch_; _wybren_

A-tone-ment, _iawn_; _cymmod_

At-tach-ment, _gafaeliad_; _ymlyniad_

At-tain-ment, _cyrhaeddiad_, _caffaeliad_; _dysg_

At-tend-ance, _gweinyddiad_, _gwasanaeth_; _gosgordd_

At-tend-ant, _cydymaith_; _gwas_; _dilynol_

At-ten-tion, _ystyriaeth_; _gwrandawiad_

At-ten-tive, _ystyriol_; _ymwrandawgar_

At-ti-tude, _ystum_, _agwedd_

At-tor-ney, _attyrnai_, _cyfreithiwr_

At-trac-tion, _attyniad_, _tyniad_

At-trib-ute, _priodoledd_: _priodoli_; _cyfrif_

Auc-tion-eer, _arwerthydd_, _arwerthwr_

Au-da-cious, _hyf_; _haerllug_; _rhyfygus_

Au-di-ble, _hyglyw_; _llafar_, _croyw_

Au-di-tor, _clywiadur_; _prawiadur_

Au-di-ence, _clyw_; _gwrandawyr_

Au-then-tic, _awduredig_; _credadwy_

Au-thor-ize, _awdurdodi_, _cefnogi_

Av-a-rice, _cybydd-dod_, _trachwant_

Av-e-nue, _dyfodfa_, _cyntedd_; _rhodfa_

Av-er-age, _cyfartaledd_; _canolrif_; _cyfartal_, _canolaidd_: _cyfartalu_, _canoli_

A-ver-sion, _gwrthwyneb_; _casineb_

Aw-ful-ness, _arswydoldeb_; _uthredd_

Bach-e-lor, _anweddog_; _gwryf_

Back-slid-ing, _gwrthgiliad_; _gwrthgiliol_

Bal-co-ny, _balcawd_, _murdalffen_

Ban-dit-ti, _ysbeilwyr_, _ysbeildorf_

Ban-ish-ment, _alltudiaeth_; _deoliad_

Bar-ba-rism, _barbariaith_; _annysg_, _anfoes_

Bar-ba-rous, _barbaraidd_; _difoes_

Bar-ren-ness, _anffrwythlondeb_; _diepiledd_

Bar-ri-cade, _brysgaer_; _attalgaer_: _attalgau_

Bar-ri-er, _attalgaer_; _terfyn_

Bar-ris-ter, _dadleuydd_, _bargyfreithiwr_

Bat-tal-ion, _cadfyddin_, _cadfagad_

Bat-ter-y, _magnelfa_, _hyrddglawdd_

Bat-tle-ment, _canllaw_; _murganllaw_

Bay-o-net, _gwnfidog_, _bidog_

Beau-ti-ful, _teg_, _prydferth_, _hardd_, _tlws_

Be-com-ing, _gweddus_, _cymhwys_, _hardd_

Bed-cham-ber, _ystafell wely_, _cysgell_

Be-gin-ning, _dechreuad_; _cychwyniad_; _pen_

Be-hav-iour, _ymddygiad_, _ymarweddiad_, _moes_

Be-liev-er, _credadyn_, _crediniwr_

Ben-e-fice, _glwysfudd_, _bywoliaeth eglwysig_

Ben-e-fit, _budd_, _lles_; _ennill_: _buddio_; _manteisio_

Bev-er-age, _diod_, _diodlyn_; _diodrodd_

Big-a-my, _dwyweddogaeth_, _dwywreiciaeth_

Bi-sec-tion, _deubarthiad_, _rhaniad_

Bis-sex-tile, _blwyddyn naid_

Bit-ter-ness, _chwerwedd_; _bustledd_

Bit-u-men, _duglist_, _daiarbyg_

Black-ber-ry, _mwyaren_, _mwyaren ddu_

Blas-phe-my, _cabledd_; _difenwad_

Blus-ter-ous, _dadyrddus_, _trystfawr_

Bod-i-ly, _corfforol_; _yn gorfforol_

Bois-ter-ous, _tymmestlog_, _ystormus_

Bom-bard-ment, _llosbelgyrch_, _llosgbeliad_

Bot-a-ny, _llysieuaeth_, _planigaeth_

Bot-tom-less, _diwaelod_

Bound-a-ry, _terfyn_, _cyffinedd_, _ffinfa_

Boun-ti-ful, _hael_, _haelionus_, _elusenol_

Brav-er-y, _dewredd_, _gwroldeb_, _calondid_

Broth-er-hood, _brawdoliaeth_; _cymdeithas_

Broth-er-ly, _brawdol_, _serchog_; _yn frawdol_

Bull-rush-es, _llafrwyn_, _corsfrwyn_

Bur-den-some, _trwm_, _pwysfawr_, _beichus_

Burg-la-ry, _tydoriad_, _toriad ty_

Bur-i-al, _angladd_, _claddedigaeth_, _cynhebrwng_

But-ter-fly, _ilir_, _gloywyn byw_

But-ter-milk, _llaeth enwyn_, _enwyn_

Cab-i-net, _cafell_; _y cyfrin-gynghor_: _amgau_

Cal-cu-late, _cyfrif_, _rhifo_; _olrhain_; _amcanu_

Cal-en-dar, _blwyddiadur_; _coflyfr_: _coflyfru_

Cal-um-ny, _camgyhuddiad_, _athrod_

Can-di-date, _ymgeisiwr_, _cystadleuydd_

Can-dle-stick, _canwyllbren_, _goleusaf_

Can-non-ade, _cyflegriad_: _cyflegru_

Ca-pa-ble, _galluog_; _medrus_; _deallus_

Ca-pa-cious, _cynnwysfawr_, _helaeth_, _eang_

Cap-i-tal, _argyffre_, _cynsawdd_; _ariansawdd_; _priflythyren_; _prif_; _rhagorol_

Cap-i-tol, _y Capitol_; _cabidwl_; _llywotty_

Ca-pri-cious, _mympwyol_, _anwadal_

Cap-ti-vate, _caethgludedig_: _caethiwo_; _darostwng_

Car-a-van, _teithlu_, _myntai_; _cludfen_

Car-di-nal, _cyniadur_, _prifor_; _prif_, _penaf_

Car-pen-ter, _saer_, _pensaer coedsaer_

Car-ti-lage, _madruddyn_, _madrudd_

Cas-u-al, _damweiniol_, _dygwyddol_

Cat-a-comb, _beddogof_, _claddogof_

Cat-a-logue, _cofres_, _mynegfa_: _cofrestru_

Cat-a-ract, _rhaiadr_, _dyfrgwymp_

Cat-e-chise, _egwyddori_, _holwyddori_

Cat-e-chism, _holwyddoreg_, _egwyddoreg_

Ca-the-dral, _eglwys gadeiriol_, _esgoblan_

Cath-o-lic, _pabydd_; _cyffredinol_; _haelfrydig_

Cav-al-ry, _marchlu_, _marchfyddin_, _marchfilwyr_

Cav-i-ty, _ceuedd_, _ceudwll_; _pant_

Cel-e-brate, _dathlu_, _clodfori_; _cadw_, _cynnal_

Ce-les-tial, _nefolydd_; _nefol_, _nefolaidd_

Cen-tu-ry, _canrif_, _canmlwydd_

Cer-tain-ty, _sicrwydd_, _diamheuadd_

Cer-ti-fy, _sicrhau_, _ardystio_; _gwirio_

Cham-ber-lain, _ystafellydd_, _ystafellwas_

Cham-ber-maid, _ystafellyddes_, _morwyn ystafell_

Cham-pi-on, _campwr_; _ymdrechwr_; _gwron_

Chan-cel-lor, _canghellydd_, _canghellor_

Chan-cer-y, _canghellys_; _llys cydwybod_

Change-a-ble, _newidiol_, _cyfnewidiol_

Char-ac-ter, _nodweddiad_, _cymmeriad_; _arwydd_: _darlunio_, _dysgrifio_; _cerfio_

Charge-a-ble, _gofynadwy_; _cyhuddadwy_; _costus_

Char-i-ot, _cerbyd_; _carrod_

Char-i-ty, _cariad_, _elusen_; _ewyllys da_

Chas-tise-ment, _cerydd_, _cospedigaeth_

Chas-ti-ty, _diweirdeb_, _dihalogrwydd_

Chiv-al-ry, _marchofyddiaeth_; _gwroniaeth_

Chron-i-cle, _brut_, _cronicl_, _oeslyfr_: _brutio_, _coflyfru_, _hanesu_

Cir-cu-lar, _cylchlythyr_; _cylchol_, _cynghrwn_

Cir-cu-late, _amlifo_; _cylchlifo_; _gwasgaru_

Cir-cum-cise, _enwaedu_; _blaendori_

Cir-cum-flex, _hirnod_, _hiracen_

Cir-cum-scribe, _amgau_, _cylchynu_; _amlinellu_

Cir-cum-spect, _amwel_; _gochelgar_; _gofalus_; _ystyriol_

Cir-cum-stance, _amgylchiad_; _dygwyddiad_; _sefyllfa_; _amgylchiadu_; _damweinio_

Cit-a-del, _castell_, _amddiffynfa_, _tŵr_

Ci-ta-tion, _cerydd_; _dyfyneb_; _crybwylliad_

Cit-i-zen, _dinesydd_; _trefwr_

Civ-il-ize, _gwareiddio_, _moesoli_

Clam-or-ous, _dadyrddus_, _trystfawr_

Clan-des-tine, _cuddiedig_, _lladradaidd_

Clar-i-fy, _teru_, _gloywi_, _puro_

Clas-si-fy, _dosbarthu_, _trefnu_

Clean-li-ness, _glendid_, _glanweithdra_

Clem-en-cy, _hynawsedd_, _tiriondeb_, _tosturi_

Cler-gy-man, _offeiriad_, _gwr llên_, _clerigwr_

Co-e-qual, _gogystal_, _cyfartal_, _cydradd_

Co-hab-it, _cyttrigo_, _cydfyw_, _cydanneddu_

Co-her-ence, _cydlyniad_; _cyssylltiad_

Co-her-ent, _cydlynol_; _cyssylltedig_

Co-he-sion, _cydlyniad_, _glyniad_

Co-in-cide, _cyttaro_; _cytuno_; _ymgyfarfod_

Col-lec-tion, _casgliad_, _cynnulliad_; _detholiad_

Col-lec-tive, _cynnulliadol_, _cryno_

Col-lect-or, _casglwr_; _cyllidydd_

Col-li-sion, _gwrthdarawiad_; _cyferbyniad_

Col-lo-quy, _ymddyddan_, _siarad_, _llafar gwlad_

Col-o-ny, _trefedigaeth_; _trefedigion_

Com-bus-tion, _cydlosgiad_, _ennyniad_

Come-li-ness, _gweddusder_, _prydferthwch_

Com-fort-er, _cysurwr_, _dyddanydd_

Com-mand-er, _penaeth_, _llywydd_, _blaenor_

Com-mand-ment, _gorchymmyn_, _arch_; _awdurdod_

Com-mence-ment, _dechreuad_; _cychwyniad_

Com-mer-cial, _masnachol_, _trafnidiol_

Com-mis-sion, _gwneuthuriad_; _swyddogaeth_; _gorchymmyn_: _awdurdodi_; _swyddogi_

Com-mit-ment, _gwneuthuriad_; _traddodiad_

Com-mit-tee, _pwyllgor_; _cyfeisteddiad_

Com-mo-dore, _morlyw_, _morlywydd_

Com-mon-ly, _yn gyffredin_; _gan amlaf_

Com-mon-wealth, _gwladwriaeth_; _gwerinlywodraeth_

Com-mo-tion, _cyffro_, _terfysg_, _aflonyddwch_

Com-mu-nion, _cymmundeb_; _cymdeithas_

Com-pan-ion, _cydymaith_, _cydweinydd_

Com-pa-ny, _cymdeithas_; _cymdeithion_: _cymdeithio_; _cyfrinachu_

Com-pas-sion, _tosturi_, _trugaredd_; _cydymdeimlad_

Com-pen-sate, _talu_, _ad-dalu_; _gwobrwyo_

Com-pe-tent, _digonol_, _cymhwys_, _addas_

Com-ple-ment, _cyflanw_; _cyflawniad_; _llawnrif_

Com-plex-ion, _gwedd_, _gwynebpryd_

Com-pli-ance, _cydsyniad_, _ymostyngiad_

Com-pli-cate, _cymhleth_: _cymhlethu_; _cymmysgu_

Com-pli-ment, _moesair_; _cyfarchiad_: _canmawl_, _cyfarch_

Com-po-nent, _elfen_, _cyfansoddai_; _cyfansoddol_

Com-pos-ite, _cyfansawdd_, _cymmysg_

Com-pos-ure, _tawelwch_, _llonyddwch_; _trefn_

Com-pre-hend, _cynnwys_; _amgyffred_, _deall_

Com-pres-sion, _cydwasgiad_, _amwasgiad_

Com-pro-mise, _cyfaddawd_, _cytundeb_: _cyfaddaw_; _ymgytuno â_

Com-pul-sion, _gorfod_, _gorfodaeth_, _cymhelliad_

Com-pul-sive, _gorfodol_, _dirgymhellol_

Con-ceal-ment, _celedigaeth_: _cuddfa_

Con-ceit-ed, _hunandybus_, _gwagfalch_

Con-cen-trate, _cymherfeddu_, _canolbwyntio_

Con-cep-tion, _ymgael_, _beichiogi_; _deall_

Con-cern-ing, _am_, _yng nghylch_, _o ran_, _o herwydd_: _mewn perthynas i_

Con-cise-ly, _yn fyr_, _yn gryno_; _ar air_

Con-clu-sion, _terfyn_, _diwedd_; _diweddglo_; _casgliad_

Con-clu-sive, _penderfynol_; _casgladwy_

Con-cord-ance, _cytundeb_; _mynegiadur_

Con-cu-bine, _gordderch_, _gordderchwraig_

Con-cur-rence, _cytundeb_; _cydymgyrch_

Con-cur-rent, _cyfred_, _cydred_; _cydredol_

Con-cus-sion, _ysgydwad_, _cyttrawiad_

Con-de-scend, _ymostwng_; _teilyngu_

Con-di-tion, _cyflwr_, _helynt_; _ammod_: _ammodi_; _cytuno_

Con-du-cive, _tueddol_, _llesol_, _gwasanaethgar_

Con-duct-or, _arweinydd_; _llywydd_

Con-fer-ence, _cynnadledd_; _ymgynghoriad_

Con-fes-sion, _cyffes_, _addefiad_; _proffes_

Con-fi-dence, _hyder_, _ymddiried_; _cred_

Con-fi-dent, _cyfrinachydd_; _hyderus_; _hyf_

Con-fine-ment, _attaliad_; _carchariad_; _gwelyfod_

Con-fis-cate, _attafaeledig_: _attafaelu_, _fforffetu_

Con-flu-ence, _cymmer_, _cydlif_; _cydffrydiad_

Con-flu-ent, _cydlifol_, _aberol_, _cydlifeiriol_

Con-fu-sion, _cymmysgedd_; _terfysg_

Con-gre-gate, _cynnull_, _crynhoi_; _ymdyru_

Con-jec-ture, _amcan_, _tyb_: _tybio_, _amcanu_

Con-ju-gal, _priodasol_; _cydieuog_

Con-ju-gate, _cyfieuair_: _cyfieuo_; _treiglo_

Con-junc-tion, _cyssylltiad_; _cyssylltair_

Con-nec-tion, _cyssylltiad_, _cydiad_; _perthynas_

Con-quer-or, _gorchfygwr_, _buddugoliaethwr_

Con-se-crate, _cyssegru_; _santeiddio_

Con-se-quence, _canlyniad_; _effaith_; _pwys_

Con-se-quent, _canlyniad_; _canlynol_

Con-sid-er, _ystyried_, _meddwl_; _myfyrio_

Con-sign-ment, _trosiad_; _trosglwyddeb_

Con-sist-ence, _tewdra_, _sylwedd_; _cyfansoddiad_

Con-sist-ent, _cysson_, _cytunol_, _cydweddol_

Con-so-nant, _cydsain_; _cydseiniol_

Con-sta-ble, _heddwas_; _penceidwad_

Con-stan-cy, _gwastadrwydd_, _dianwadalwch_

Con-sti-tute, _gosod_; _cyfansoddi_; _sefydlu_

Con-struc-tion, _adail_; _cyfansoddiad_; _cystrawen_

Con-sump-tion, _traul_; _darfodedigaeth_

Con-ta-gious, _heintus_; _adwythig_

Con-tem-plate, _myfyrio_, _ymsynied_; _bwriadu_

Con-tend-ing, _ymryson_; _gwrthwynebol_

Con-ten-tion, _ymryson_, _ymrafael_, _anghydfod_

Con-ten-tious, _ymrysongar_, _amrafaelgar_

Con-tent-ment, _boddlonrwydd_, _boddhâd_

Con-ti-nence, _diweirdeb_; _ymattal_

Con-ti-nent, _cyfandir_; _diwair_

Con-tin-ue, _parhau_; _sefyll_; _oedi_

Con-tra-band, _gwaharddiad_; _gwaharddedig_

Con-tract-ed, _talfyr_; _cyfyng_; _ammodedig_

Con-trac-tion, _crybychiad_; _talfyriad_; _crynodeb_

Con-tra-dict, _gwrthddywedyd_; _gwrthwynebu_

Con-tra-ry, _y gwrthwyneb_; _gwrthwynebus_

Con-trib-ute, _cyfranu_; _cynnorthwyo_; _llesäu_

Con-triv-ance, _dyfais_, _dychymmyg_; _cyfrwysder_

Con-tro-vert, _dadleu_; _gwrthddadlu_

Con-tu-sion, _pwyad_; _yssigiad_; _maluriad_

Con-ven-tion, _eisteddfod_, _cymmanfa_; _undeb_

Con-vers-ant, _cynnefin_, _cyfarwydd_

Con-ver-sion, _troad_, _troëdigaeth_; _cyfnewidiad_

Con-vey-ance, _cludiad_, _trosglwyddiad_, _gweithred tir_

Con-vic-tion, _argyhoeddiad_; _dyfarniad_

Con-vul-sion, _dirdyniad_; _dirgynhwrf_

Con-vul-sive, _dirdynol_; _dirgrynol_

Co-pi-ous, _helaeth_, _llawn_; _cynnwysfawr_

Cop-u-late, _cydio_, _ymgydio_; _cymharu_

Cor-di-al, _sirgyffyr_, _cysurlyn_; _calonog_; _serchog_; _gwresog_; _adfywiol_

Cor-mo-rant, _morfran_, _mulfran_

Cor-o-ner, _trengholwr_; _crwner_

Cor-po-ral, _dengwriad_; _corfforol_; _defnyddiol_

Cor-po-rate, _corfforedig_; _cyffredinol_

Cor-pu-lence, _corffogrwydd_, _tewder_

Cor-pu-lent, _corffog_, _tew_, _cigog_

Cor-rec-tion, _cyweiriad_, _gwelliant_; _cerydd_

Cor-rect-ly, _yn gywir_; _yn fanwl_

Cor-re-spond, _cyfateb_; _gohebu_

Cor-rup-tion, _llygredigaeth_, _halogrwydd_; _gôr_

Coun-sel-lor, _cynghorwr_, _dadleuwr_

Coun-te-nance, _gwyneb_, _gwynepryd_: _cefnogi_

Coun-ter-act, _gwrthweithredu_; _gwrthsefyll_

Coun-ter-feit, _ffugiwr_; _ffugiol_: _ffugio_

Coun-ter-pane, _torsed_, _cwrlid_, _huling_

Cour-a-geous, _dewr_, _gwrol_, _calonog_

Cou-ri-er, _brysgenad_, _negesydd_

Cour-te-ous, _hyfoes_, _moesgar_, _boneddigaidd_

Cov-e-nant, _cyfammod_, _cytundeb_

Cov-et-ous, _trachwantus_, _cybyddlyd_

Cre-a-tion, _creadigaeth_; _cread_; _y bydysawd_

Cred-i-ble, _credadwy_, _coeladwy_

Cred-it-or, _achretor_, _gofynwr_, _coeliwr_

Crim-in-al, _troseddwr_, _drygweithredydd_; _troseddog_

Crit-ic-al, _beirniadol_; _manwl_, _enbyd_

Crit-i-cise, _beirniadu_; _arholi_; _beio_

Crook-ed-ness, _camedd_; _bachogrwydd_

Cru-ci-ble, _toddlestr_, _toddiadur_

Cru-ci-fy, _croeshoelio_, _hoelio ar y groes_

Cru-el-ty, _creulondeb_, _mileindra_

Cul-pa-ble, _beius_, _ar y cam_; _euog_

Cul-ti-vate, _diwyllio_, _amaethu_; _gwareiddio_

Cum-ber-some, _rhwystrus_; _beichiol_; _cymmysg_

Cur-a-ble, _gwelladwy_, _iachadwy_

Cu-ri-ous, _cywrain manwl_; _ymchwilgar_

Cur-ren-cy, _cylchrediad_, _treigliad_, _arian treigl_

Cur-va-ture, _camedd_, _crymedd_

Cus-to-dy, _cadwraeth_; _dalfa_, _carchar_

Cus-tom-er, _prynwr_, _cwsmer_, _derbynydd_

Dam-na-tion, _colledigaeth_, _damnedigaeth_

Dan-ger-ous, _peryglus_, _enbyd_; _niweidiol_

De-bauch-ment, _llygriad_, _halogiad_; _hud_

De-ben-ture, _dylysgrif_, _hawleb_, _hawlysgrif_

De-cay-ing, _methiant_, _dadfail_

De-ceit-ful, _twyllodrus_, _dichellgar_

De-ceiv-ing, _twylliad_, _hocediad_; _twyll_

De-cem-ber, _Rhagfyr_

De-cen-cy, _gweddusrwydd_, _harddwch_

De-cep-tion, _twyll_, _hud_, _dichell_, _ffalsedd_

De-ci-mals, _degiadaeth_, _degraniaeth_

De-ci-pher, _dehongli_, _egluro_, _darllen celnodau_

De-cis-ion, _penderfyinad_; _barniad_

De-ci-sive, _penderfynol_, _terfynol_

De-clar-ing, _mynegiad_, _traethiad_; _amlygiad_

De-clen-sion, _gogwyddiad_; _treigliad_

De-clin-ing, _ar ogwydd_, _ar ball_, _yn ammharu_

De-coc-tion, _trwyth_; _berwad_

De-com-pose, _dadgyfansoddi_; _dadgyssylltu_

Dec-o-rate, _addurno_, _harddu_, _prydferthu_

De-co-rous, _gweddus_, _addwyn_: _trefnus_

De-co-rum, _gweddusder_, _harddwch_; _trefn_

Ded-i-cate, _cyflwynedig_: _cyflwyno_, _cyssegru_

De-duc-tion, _tyniad ymaith_; _lleihad_

De-fault-er, _pallwr_, _methwr_: _palldalwr_

De-fec-tive, _gwallus_, _ammherffaith_

De-fend-ant, _amddiffynydd_; _amddiffynol_

De-fen-sive, _amddiffyn_; _amddiffynol_

Def-er-ence, _parch_, _bri_; _ymostyngiad_

De-fi-ance, _her_, _beiddiad_, _sialens_

De-fi-cient, _dyffygiol_; _ammherffaith_

Def-i-nite, _peth dosbenedig_; _dosbenol_; _penodol_; _sicr_; _eglur_

De-flec-tion, _osgoad_, _gogwyddiad_; _enciliad_

De-fray-ing, _digostiad_, _costddygiad_

De-i-ty, _Duwdod_, _Duwdeb_

De-ject-ed, _llwfr_, _trist_, _galarus_

De-jec-tion, _prudd-der_, _tristwch_

Del-e-gate, _cenad_, _cenadwr_: _cenadu_, _dirprwyo_

Del-i-cate, _tyner_; _mwythus_; _moesgar_; _gwanaidd_; _canaidd_

De-li-cious, _danteithiol_; _melusber_; _hyfryd_

De-light-ful, _hyfryd_, _difyr_, _hoff_

De-lin-quent, _troseddwr_; _beius_, _camweddus_

De-liv-er, _gwaredu_, _achub_; _traddodi_; _traethu_

De-lu-sion, _twyll_, _hudoliaeth_; _cyfeiliornad_

De-mean-or, _ymddygiad_, _buchedd_; _dull_

De-mer-it, _anhaeddiant_: _anhaeddu_

De-mol-ish, _dinystrio_, _dystrywio_; _difrodi_

De-mon-strate, _arddangos_, _profi_, _hysbysu_

De-ni-al, _gwad_, _gwadiad_; _nag_, _nacâd_

Den-si-ty, _tewedd_, _dwysder_, _cynnwysedd_

De-part-ment, _lle_, _swydd_; _dosbarth_; _talaeth_

De-part-ure, _ymadawiad_; _marwolaeth_

De-pend-ence, _ymddibyniad_, _ymddiried_

De-pend-ent, _dibynwr_, _ymddibynydd_

De-po-nent, _gwaesafydd_; _tystiwr_, _ardyst_

De-pos-it, _adneu_, _gwystl_: _dodi_, _rhoddi_, _gosod_

Dep-re-cate, _gwrthymbil_; _erfyn_; _gofidio am_

De-pres-sion, _iseliad_, _gostyngiad_; _trymder_

Dep-u-ty, _rhaglaw_, _dirprwywr_, _cenad_

De-range-ment, _annhrefn_; _dyryswch_

De-ri-sion, _gwatwariad_, _gwawdiad_

De-scend-ant, _disgynydd_; _hiliogaeth_

De-scend-ed, _disgynedig_; _hanedig_

De-scrip-tion, _darluniad_; _adroddiad_; _ysgrifeniad_

De-scrip-tive, _darluniol_, _dysgrifiol_

De-sert-er, _ffoadur_, _enciliwr_

De-serv-ing, _haeddiant_; _teilyngdod_; _haeddiannol_

Des-ig-nate, _penodedig_: _dynodi_, _arwyddocäu_

De-sir-ous, _chwannog_, _awyddus_

Des-o-late, _anghyfannedd_: _anghyfanneddu_, _diffeitheio_; _difrodi_

Des-pe-rate, _diobaith_; _ffyrnig_; _peryglus_

Des-pot-ic, _gormesdeyrnog_; _creulawn_

Des-pot-ism, _trawsawdurdod_; _gormesdeyrnedd_

Des-ti-ny, _tynged_; _ffawd_, _rhaid_

Des-ti-tute, _amddifad_; _angenog_: _amddifadu_

De-struc-tion, _dystryw_, _dinystr_; _colledigaeth_

De-struc-tive, _dystrywiol_, _dinystriol_; _marwol_

De-tach-ment, _dydoliad_; _gwahanlu_

De-tec-tion, _dadguddiad_; _canfyddiad_

De-ter-mine, _penderfynu_; _penu_, _bwriadu_

Det-ri-ment, _colled_, _niwed_; _aflwydd_

De-vel-op, _dadhuddo_, _dadblygu_; _dadguddio_

De-vi-ate, _gwyro_; _cyfeiliorni_; _cilio_

De-vo-tion, _dyhewyd_, _duwiolder_; _addoliad_

Di-a-dem, _coron_, _talaith_

Di-a-gram, _llun_, _darlun_, _arddangosddull_

Di-a-lect, _priodiaith_, _amrywiaith_; _iaith_

Di-a-logue, _ymddyddan_, _cynnadledd_

Di-a-mond, _adamant_; _gemlythyren_

Di-a-ry, _dyddiadur_, _dyddlyfr_

Dic-ta-tion, _gorchymmyniad_; _dywediad_

Dic-ta-tor, _penrheolwr_; _gwersroddwr_

Dif-fer-ence, _gwahaniaeth_; _anghytundeb_: _gwahaniaethu_, _gwahanu_

Dif-fer-ent, _gwahanol_, _amrywiol_, _amgen_

Dif-fi-cult, _anhawdd_, _dyrys_, _trallodus_.

Dif-fi-dence, _anymddiried_, _anhyder_

Dif-fi-dent, _anymddiriedus_, _anhyderus_

Dif-fu-sion, _taeniad_, _lledaeniad_, _gwasgariad_

Di-ges-tion, _treuliant_, _traul ymborth_

Dig-ni-fy, _urddasu_, _anrhydeddu_; _urddo_

Dig-ni-ty, _urddas_, _bri_, _cymmeriad_; _uchelradd_

Di-gres-sion, _crwydriad_, _ysgoad_, _enciliad_

Dil-i-gence, _dyfalwch_, _diwydrwydd_; _prysurglud_

Dil-i-gent, _dyfal_, _diwyd_, _prysur_, _gofalus_

Di-men-sion, _mesur_, _maint_, _maintioli_

Di-min-ish, _lleihau_, _prinhau_; _bychanu_

Di-o-cese, _esgobaeth_, _esgobawd_

Di-plo-ma, _graddlythyr_, _urddlythyr_

Di-rec-tion, _cyfeiriad_, _hyfforddiad_; _gorchymmyn_

Di-rect-ly, _yn union_, _yn gyfeiriol_; _yn ddioed_; _ar gyfer_; _yn ddigyfrwng_

Di-rect-or, _cyfarwyddwr_; _arolygydd_; _cynghorwr_

Dis-a-ble, _analluogi_, _anaddasu_; _rhwystro_

Dis-a-gree, _anghytuno_, _anghydsynio_

Dis-al-low, _llysu_, _gwrthod_, _anghymmeradwyo_

Dis-an-nul, _dilëu_, _diddymu_, _dirymu_

Dis-ap-pear, _diflanu_, _dadymddangos_

Dis-ap-point, _somi_, _twyllo_

Dis-ap-prove, _anghymmeradwyo_; _gwrthod_

Dis-as-ter, _trychineb_, _anffawd_: _mallu_, _aflwyddo_

Dis-as-trous, _trychinebus_; _anffodus_

Dis-be-lief, _anghrediniaeth_, _anghred_

Dis-be-lieve, _anghredu_, _anghoelio_

Dis-burse-ment, _taliad_, _traul_

Dis-cern-ing, _dirnadaeth_; _craffus_, _deallus_

Dis-ci-ple, _dysgybl_; _ysgoläig_: _dysgu_

Dis-ci-pline, _dysgyblaeth_: _dysgyblu_

Dis-clos-ure, _dynoethiad_, _dadguddiad_

Dis-com-fit, _gorchfygiad_: _gorchfygu_

Dis-com-pose, _aflonyddu_; _annhrefnu_

Dis-con-tent, _anfoddlawn_: _anfoddloni_

Dis-cov-er, _darganfod_, _dadguddio_

Dis-cour-age, _anghefnogi_, _llyfrhau_

Dis-cred-it, _anghlod_: _gwarthruddo_

Dis-cre-tion, _callineb_, _synwyr_, _pwyll_

Dis-cus-sion, _holiad_, _chwiliad_, _dadleuad_

Dis-dain-ful, _diystyrllyd_, _dirmygol_

Dis-em-bark, _tirio_, _glanio_, _dadlongi_

Dis-em-bogue, _ymarllwys_; _ymdywallt_

Dis-en-gage, _rhyddhau_; _dadrysu_

Dis-en-thral, _dadgaethiwo_; _rhyddhau_

Dis-fig-ure, _anffurfio_, _aflunio_

Dis-fran-chise, _difreinio_, _difreintio_

Dis-grace-ful, _gwarthus_, _gwaradwyddus_

Dis-gust-ing, _diflas_, _ffiaidd_, _anhyfryd_

Dis-hon-est, _anonest_, _anghyfiawn_

Dis-hon-our, _dianrhydedd_: _dianrhydeddu_

Dis-junc-tion, _dadgyssylltiad_, _gwahaniad_

Dis-lo-cate, _dadgymmalu_; _symmud_

Dis-mis-sion, _gollyngdod_, _rhyddhâd_

Dis-o-bey, _anufyddhau_; _troseddu_

Dis-or-der, _annhrefn_: _annhrefnu_

Dis-par-age, _bychanu_, _dirmygu_, _dibrisio_

Dis-pleas-ure, _anfoddlonrwydd_; _digofaint_

Dis-pos-al, _trefniad_; _triniaeth_; _gwerthiad_

Dis-pos-sess, _difeddiannu difuddio_

Dis-re-gard, _esgeulusdod_; _diystyrwch_: _esgeuluso_; _diystyru_

Dis-sem-ble, _ffugio_, _rhagrithio_; _celu_

Dis-sen-sion, _anghydfod_, _anghydsyniad_

Dis-si-pate, _gwasgaru_; _gwastraffu_

Dis-so-lute, _penrydd_; _afradlawn_

Dis-tem-per, _clefyd_, _afiechyd_: _heintio_; _llygru_

Dis-tinc-tion, _gwahaniaeth_; _rhagoriaeth_

Dis-tinct-ive, _gwahaniaethol_; _dirnadol_

Dis-tin-guish, _gwahaniaethu_, _dynodi_; _canfod_

Dis-tress-ing, _gofidus_, _trallodus_, _poenus_

Dis-trib-ute, _cyfranu_, _dosbarthu_, _parthu_

Dis-turb-ance, _aflonyddwch_, _cynhwrf_

Di-ver-sion, _difyrwch_, _digrifwch_

Div-i-dend, _rhan_, _cyfran_; _talgyfran_

Di-vis-ion, _rhaniad_, _parthiad_, _ysgâr_

Di-ur-nal, _dyddiadur_; _dyddiol_

Diz-zi-ness, _syfrdandod_, _pendro_

Doc-u-ment, _addysg_; _prawfysgrif_: _addysgu_

Do-mes-tic, _cartrefol_, _teuluaidd_

Dom-i-neer, _arglwyddiaethu_, _llywodraethu_

Do-min-ion, _arglwyddiaeth_, _llywodraeth_

Do-na-tion, _rhodd_, _anrheg_; _rhoddiad_

Dow-a-ger, _gwaddolog_, _gweddw waddolog_

Drow-si-ness, _cysgadrwydd_, _syrthni_

Du-bi-ous, _amhëus_; _ansefydlog_

Du-pli-cate, _adysgrifen_; _dyblygu_

Du-ra-ble, _parhäus_, _parhaol_

Du-ra-tion, _parhâd_, _ysbaid_

Du-ti-ful, _ufydd_, _gostyngedig_; _parchus_

Dy-nas-ty, _llywodlin_, _breninlin_; _llywodraeth_

Ea-ger-ness, _taerni_, _awydd_; _taerflys_

Ea-ger-ly, _yn daer_, _yn awyddus_

Ear-nest-ly, _yn ddifrifol_; _o ddifrif_

Earth-en-ware, _llestri pridd_, _priddlestri_

Ea-si-ly, _yn esmwyth_; _yn rhwydd_

Eat-a-ble, _bwytadwy_, _hyfwyd_

Eat-a-bles, _bwydydd_, _lluniaeth_

Ec-cen-tric, _afreolaidd_, _gwyrog_; _hynod_

Ed-i-ble, _bwytadwy_, _hyfwyd_

Ed-i-fice, _adeilad_; _adeiladaeth_

Ed-i-fy, _adeiladu_; _addysgu_, _hyfforddi_

E-di-tion, _argraffiad_; _cyhoeddiad_

Ed-i-tor, _golygydd_; _cyhoeddwr_

Ed-u-cate, _addysgu_, _hyfforddi_; _dysgu_

Ef-fect-ive, _effeithiol_

Ef-fi-cient, _effeithiol_, _achosol_, _galluog_

Ef-fi-gy, _llun_, _delw_; _gwrthrych_

E-go-tism, _myfïaeth_, _hunanoldeb_

E-gre-gious, _nodedig_, _rhagorol_; _digyffelyb_

E-jec-tion, _bwriad allan didyad_

E-ject-ment, _didyad_, _difeddiannad_

E-las-tic, _hydwyth_, _gwrthneidiol_, _ystwyth_

E-lec-tion, _etholiad_, _dewisiad_

E-lect-ive, _etholiadol_, _dewisiadol_

El-e-gance, _tlysni_, _gwychder_, _tegwch_

El-e-gant, _tlws_, _dillynaidd_; _glandeg_

El-e-gy, _galarnad_, _marwnad_, _alaethgan_

El-e-ment, _elfen_, _defnydd_: _elfenu_; _egwyddori_

El-e-phant, _cawrfil_, _elephant_; _oliffant_

El-e-vate, _dyrchafu_, _cyfodi_; _mawrhau_

El-lip-sis, _hirgylch_, _hirgrwn_; _diffyg_

E-lope-ment, _ciliad_, _dirgeliad_; _enciliad gyda chariad_

El-o-quence, _hyawdledd_, _ffraethineb_

El-o-quent, _hyawdl_, _ffraeth_, _ymadroddus_

Em-a-nate, _teneuo_, _culhau_; _nychu_

Em-bank-ment, _argloddiad_; _arglawdd_, _argae_

Em-bar-rass, _dyrysu_, _nidro_; _trallodi_

Em-bas-sy, _cenadaeth_, _cenadwriaeth_

Em-bel-lish, _addurno_, _harddu_, _prydferthu_

Em-bez-zle, _darnguddio_, _celcio_, _lladrata_

Em-bod-y, _corffori_, _cydgorffoli_; _tewychu_

Em-bra-sure, _muragoriad_, _muregor_

Em-bry-o, _anelwig_, _gorllyd_, _milrith_

E-met-ic, _cyfog_; _cyfogol_; _gloesbair_

Em-i-grant, _ymfudwr_; _ymfudol_

Em-i-grate, _ymfudo_; _mudo_, _trawsfudo_

Em-i-nence, _uchelfa_, _uchder_; _mawredd_

Em-i-nent, _uchel_; _godidog_, _hynod_

E-mo-tion, _cyffro_, _cynhyrfiad_, _cyffrawd_

Em-per-or, _amherawdwr_, _ymherawdwr_

Em-pha-sis, _pwyslais_; _pwysnod_

Em-pha-tic, _pwysig_, _pwysleisiol_; _nerthol_

Em-ploy-ment, _gwaith_, _gorchwyliaeth_; _galwad_

Em-ploy-er, _gorchwyliwr_, _gweithosodwr_

Em-pow-er, _galluogi_, _awdurdodi_

Em-u-late, _rhagorgeisio_, _dynwared_, _efelychu_

En-a-ble, _galluogi_, _nerthu_, _cynnorthwyo_

En-a-mel, _emliw_, _gleinliw_: _emliwio_

En-a-mour, _swyno_; _traserchu yn_

En-camp-ment, _gwersylliad_; _gwersyll_

En-chant-ment, _swyn_, _cyfaredd_, _dewiniaeth_

En-cir-cle, _cylchynu_, _amgylchu_

En-clo-sure, _cae_, _cadlas_, _caeadle_

En-com-pass, _amgylchu_, _cwmpasu_; _amgau_

En-coun-ter, _ymgyrch_, _brwydr_: _ymgyrchu_, _brwydro_

En-cour-age, _cefnogi_, _calonogi_, _annog_

En-croach-ment, _cyfyngiad_; _traisfeddiant_

En-cum-ber, _lluddias_, _rhwystro_; _gorlwytho_

En-dan-ger, _peryglu_; _niweidio_, _anturio_

En-deav-our, _cais_, _ymgais_: _ymegnio_, _ymgeisio_

En-dorse-ment, _cefnysgrif_, _arysgrifen_

En-dow-ment, _gwaddol_, _cynnysgaeth_

En-du-rance, _parhâd_; _goddefiad_

En-e-my, _gelyn_, _gwrthwynebydd_

En-er-gy, _grym_, _egni_, _nerth_

En-fee-ble, _gwanhau_, _llesgau_

En-force-ment, _grymusiad_, _cadarnhâd_; _gorfodaeth_

En-fran-chise, _rhyddfreinio_, _rhyddhau_

En-gage-ment, _rhwymedigaeth_; _ammod_; _brwydr_

En-gag-ing, _deniadol_, _serchus_; _boddhaol_

En-gin-eer, _peiriannydd_, _peiriannwr_

En-grav-er, _cerfiedydd_; _cerfluniwr_

En-light-en, _goleuo_, _llewyrchu_

E-nig-ma, _dychymmyg_, _dammeg_

En-joy-ment, _mwynhâd_; _meddiant_; _hyfrydwch_

En-large-ment, _helaethiad_; _rhyddhâd_

En-liv-en, _adfywio_, _bywhau_, _bywiogi_

En-mi-ty, _gelyniaeth_; _casineb_

En-no-ble, _pendefigo_; _urddasu_; _ardderchogi_

E-nor-mous, _anferth_; _dirfawr_; _dychrynllyd_

En-tan-gle, _dyrysu_, _maglu_; _rhwystro_

En-ter-ing, _mynediad_; _cyntedd_

En-ter-prise, _antur_, _anturiaeth_: _anturio_

En-ter-tain, _croesawu_; _cynnal_; _derbyn_

En-tice-ment, _hudoliaeth_; _annogaeth_

En-tire-ly, _yn gyfan_, _i gyd_; _yn llwyrgwbl_

En-ti-tle, _hawlogi_; _enwi_; _addasu_

En-ti-ty, _endid_, _bod_, _hanfod_

En-treat-y, _atolwg_, _deisyfiad_, _dymuniad_

En-vel-ope, _amlen_, _gorchudd_, _amwisg_

En-vel-op, _cuddio_, _gorchuddio_, _amlenu_

En-vi-ous, _cenfigenus_; _gelynol_

En-vi-ron, _amgylchu_, _cylchynu_

En-vi-rons, _amgylchoedd_, _cylchynau_

Ep-i-cure, _glwth_, _gloddestwr_; _moethyn_

Ep-i-gram, _englyn_, _pennill_

E-pis-tle, _llythyr_, _epistol_

Ep-i-taph, _beddargraff_, _beddysgrif_

Ep-i-thet, _cyfenw_, _ansoddair_, _chwanegair_: _enwi_, _cyfenwi_; _ansoddenwi_

E-qua-tion, _cyfartaliad_; _cymmedriad_

E-qua-tor, _cyhydedd_, _llinyn y cyhydedd_

E-qui-nox, _cyhydnos_; _alban_

E-qui-page, _taclau_, _trec_; _addurnwisg_

E-quip-ment, _treciad_, _addurniad_

E-qui-poise, _cydbwys_, _mantoledd_

E-rec-tion, _codiad_; _adeiladiad_; _adail_

E-rup-tion, _rhuthr_; _crugdardd_; _bala_

Es-cu-lent, _ymborth_; _bwytadwy_

Es-pou-sal, _dyweddïad_; _dyweddïol_

Es-sen-tial, _hanfod_; _y prif bwngc_; _hanfodol_

Es-pe-cial, _neillduol_, _arbenig_

Es-tab-lish, _sefydlu_, _cadarnhau_; _sylfaenu_

Es-ti-mate, _cyfrif_, _tybgyfrif_: _prisio_

E-ter-nal, _y Tragwyddol_; _tragywyddol_

E-va-sion, _gocheliad_, _ciliad_, _dichell_

Ev-er-more, _yn wastadol_, _yn barhäus_; _byth_

Ev-e-ry, _pob_; _pawb_

Ev-i-dence, _prawf_, _tystiolaeth_; _amlygrwydd_: _profi_, _tystio_, _amlygu_

Ev-i-dent, _amlwg_, _eglur_, _hynod_

Ex-ac-tion, _myniad_, _treisgodiad_; _gormes_

Ex-act-ness, _manyldeb_, _cywirdeb_

Ex-act-ly, _yn gywir_, _yn fanwl_

Ex-am-ine, _holi_, _chwilio_, _ymofyn am_; _ystyried_; _profi_

Ex-am-ple, _engraifft_, _cynllun_; _siampl_

Ex-ca-vate, _ceuo_, _cafnu_, _cloddio_

Ex-ceed-ing, _rhagorol_; _dirfawr_; _rhagorddwyn_

Ex-cel-lence, _rhagoriaeth_, _ardderchogrwydd_

Ex-cel-lent, _rhagorol_, _godidog_, _enwog_

Ex-cep-tion, _eithrad_, _eithriad_; _gwrthddadl_

Ex-ces-sive, _gormodol_, _dirfawr_; _anghymmedrol_

Ex-cheq-uer, _trysorlys_, _sylltty_: _cyllidlysio_

Ex-cise-man, _cyllidydd_, _tollydd_; _chwilgi_

Ex-clu-sion, _bwriad allan_; _gwrthodiad_

Ex-clu-sive, _allgauadol_; _eithrol_; _oddi eithr_

Ex-cul-pate, _difeio_, _esgusodi_; _rhyddhau_

Ex-cur-sion, _gwib_, _gwibdaith_; _tramwyad_

Ex-e-cute, _gwneuthur_, _cyflawni_; _marwolaethu_

Ex-er-cise, _ymarfer_; _gorchwyl_: _arfer_, _ymarfer_

Ex-er-tion, _ymegnïad_, _ymdrechiad_; _cais_

Ex-haus-tion, _dyhysbyddiad_; _blinder_

Ex-hib-it, _prawfysgrif_: _dangos_, _arddangos_

Ex-i-gence, _angen_, _eisiau_; _cyfyngder_

Ex-i-gent, _rheidwys_; _angenrheidiol_; _cyfyng_

Ex-ist-ence, _bod_, _hanfod_; _bywyd_; _parhâd_

Ex-ist-ent, _yn bod_; _hanfodol_; _ar gael_

Ex-pan-sion, _llediad_, _taeniad_; _helaethiad_

Ex-pe-dite, _brysio_; _rhwyddhau_; _brysiol_

Ex-pen-sive, _treulfawr_, _costus_; _drud_

Ex-pi-ate, _dyhuddo_; _dyhuddo âg aberth_; _iawnu_

Ex-plic-it, _eglur_, _amlwg_; _pendant_

Ex-plo-sion, _ffrwydriad_, _ergyd_; _rhuthr_

Ex-pres-sion, _mynegiad_, _adroddiad_; _ymadrodd_; _gwasgiad_

Ex-pres-sive, _mynegol_, _traethol_; _darluniadol_

Ex-press-ly, _yn eglur_; _yn bendant_, _yn hysbys_

Ex-pul-sion, _tafliad allan_, _ymlidiad_

Ex-qui-site, _rhagorol_, _godidog_; _dewisedig_; _manwl_, _perffaith_

Ex-ten-sion, _ystyniad_; _eangiad_, _helaethiad_

Ex-ten-sive, _helaeth_, _eang_; _mawr_

Ex-tin-guish, _diffoddi_, _diffodd_; _dilëu_

Ex-tir-pate, _diwreiddio_, _dinystrio_; _symmud_

Ex-tor-tion, _cribddail_, _treisiad_; _gorthrwm_

Ex-trac-tion, _tyniad_, _tyniad allan_, _llinach_

Ex-treme-ly, _yn eithaf_; _dros ben_; _yn aruthr_

Ex-tri-cate, _rhyddhau_, _dadrysu_; _dadblygu_

Ex-trin-sic, _allanol_; _ammhriodol_

Ex-u-viæ, _pl._ _ystelion_, _diosgion_

Eye-serv-ice, _llygad-wasanaeth_

Eye-wit-ness, _llygattyst_, _golygdyst_

Fab-ri-cate, _adeiladu_; _gwneuthnr_; _dyfeisio_

Fa-ce-tious, _digrif_, _cellweirus_, _llawen_

Fac-to-ry, _gweithfa_, _gweithdy_; _masnachfa_

Fac-ul-ty, _gallu_, _medr_, _teithi_, _medrusrwydd_

Faith-ful-ness, _ffyddlondeb_; _gonestrwydd_

Fal-la-cious, _twyllodrus_, _dichellgar_

Fal-la-cy, _twyll_, _lledrith_, _hudoliaeth_

Fal-si-fy, _ffugio_; _celwyddo_; _gwyrdroi_

Fal-ter-ing, _gwendid_; _attal dywedyd_

Fam-i-ly, _teulu_, _tylwyth_; _gwaedoliaeth_

Fa-mil-iar, _cyfaill_, _cydnabod_; _teuluaidd_; _cyfeillgar_; _cynnefin_

Fan-ci-ful, _dychymmygol_, _coegdybus_

Fan-tas-tic, _gwamalddyn_; _dychymmygol_

Fas-ci-nate, _swyno_, _rhinio_, _hudo_

Fa-tal-ly, _yn angeuol_; _mewn angen_

Fath-om-less, _diwaelod_; _anamgyffred_; _dwfn_

Fa-vour-ite, _hoffddyn_, _anwylyd_, _hoffyn_

Fel-low-ship, _cymdeithas_: _cymdeithasu_

Fel-o-ny, _cyflafan_; _lladrad_

Fem-in-ine, _benywol_, _menywaidd_; _tyner_

Fe-ro-cious, _ffyrnig_, _creulawn_, _brochwyllt_

Fer-ven-cy, _gwresogrwydd_; _brwdfrydedd_

Fes-ti-val, _gwyl_; _gwledd_; _gwleddol_; _llawen_

Fil-a-ment, _edefyn_; _meinwreiddyn_

Fi-nal-ly, _yn ddiweddaf_, _yn olaf_; _o'r diwedd_

Fir-ma-ment, _ffurfafen_, _wybr_, _entrych_

Fis-tu-la, _pibell_; _pibglwyf_

Flat-ter-er, _gwenieithiwr_, _truthiwr_

Flat-u-lence, _gwyntogrwydd_, _gwyntchwydd_

Flat-u-lent, _gwyntog_, _chwyddedig_; _gwag_

Flex-i-ble, _hyblyg_, _ystwyth_; _anwadal_

Flour-ish-ing, _blodeuog_, _blagurol_; _llwyddiannus_

Fluc-tu-ate, _tonio_; _bwhwman_; _petruso_

Flu-en-cy, _ffrydiolrwydd_; _hyawdledd_

Fo-li-o, _dalen lawn_

For-as-much, _yn gymaint_, _gan_, _o herwgdd_, _am_

For-bear-ance, _dyoddefgarwch_, _ymaros_

For-bid-den, _gwaharddedig_, _gwarafunedig_

For-ci-ble, _cadarn_, _hyrym_, _nerthol_

For-eign-er, _alldud_, _estron_

Fore-know-ledge, _rhagwybodaeth_

For-get-ful, _anghofus_

For-feit-ure, _collediad_, _fforffediad_

For-give-ness, _maddeuant_, _gollyngdod_

For-giv-ing, _maddeugar_; _trugarog_

For-ma-tion, _ffurfiad_, _lluniad_

For-mer-ly, _gynt_, _cyn hyn_, _er ystalm_

For-mu-la, _ffurfreol_, _ffurf_

For-ti-fy, _cadarnhau_; _caeru_, _cryfhau_

For-tu-nate, _ffyniannus_, _ffodiog_

Foun-da-tion, _sail_, _sylfaen_

Fran-gi-ble, _hydor_, _breuol_

Fra-ter-nal, _brawdol_, _brawdgar_

Frat-ri-cide, _brawdladdiad_

Fraud-u-lence, _dichellgar_, _twyllgarwch_

Fraud-u-lent, _twyllodrus_

Friv-o-lous, _dibwys_, _disylwedd_

Frol-ic-some, _gorhoenus_, _chwareugar_

Front-is-piece, _talwyneb_; _gwyneblun_

Fro-ward-ness, _afrywiogrwydd_

Fruc-ti-fy, _cnydio_; _ffrwythiannu_

Fu-gi-tive, _ffoadur_; _ffoadurus_

Ful-mi-nate, _taranu_; _bygwth_

Fun-da-ment, _yr eisteddfa_, _rhefr_

Fu-ner-al, _angladd_; _angladdol_

Fu-ri-ous, _ffyrnig_, _gorphwyllog_

Fur-nish-ing, _diwalliad_; _dodrefniad_

Fur-ni-ture, _dodrefn_; _trec_, _taclau_

Fur-ther-ance, _rhwyddhâd_; _cynnorthwy_

Fur-ther-more, _ym mhellach_, _heb law hyny_

Fu-si-ble, _toddadwy_, _hydawdd_

Ga-bi-on, _caergawell_, _differgawell_

Gal-lant-ry, _dewredd_, _gwroldeb_

Gal-ler-y, _oriel_, _uwchlawr_

Gal-van-ism, _trydaniaeth mettelaidd_

Gar-ri-son, _gwarchadlu_; _amddiffynfa_: _gwarchlueddu_

Gath-er-ing, _cynnulliad_; _crawniad_

Gaz-et-teer, _cyhoeddwr newyddion_, _darlundraith_

Gel-a-tine, _ceuledig_

Gen-er-al, _cadflaenor_; _cyffredin_; _mynych_; _cyffredinol_

Ge-ni-al, _genedigol_; _rhywiog_; _llon_

Gen-er-ous, _haelionus_, _rhwyddgalon_

Ge-ni-us, _athrylith_, _anian_, _awen_

Gen-teel-ness, _boneddigeiddrwydd_

Gen-tle-man, _boneddwr_

Gen-tle-ness, _addfwynder_, _tiriondeb_

Gen-u-ine, _pur_, _digymmysg_

Germ-in-ate, _blaguro_, _egino_

Gid-di-ness, _penddaredd_; _y bendro_

Gi-gan-tic, _cawraidd_, _dirfawr_

Glo-ri-fy, _gogoneddu_; _mawrygu_

Glos-sa-ry, _geirddehonglydd_; _geirlyfr_

Glu-tin-ous, _gludiog_

Glut-ton-y, _glythineb_, _bolrythi_

God-li-ness, _duwioldeb_, _dwyfolder_

Gor-man-dize, _bolrythu_

Gov-ern-ess, _llywiadures_; _athrawes_

Gov-ern-ing, _llywiad_: _yn llywio_

Gov-ern-ment, _llywodraeth_

Gra-da-tion, _graddiad_, _esgyniad_

Grad-u-al, _graddol_, _graddesgynol_

Grad-u-ate, _graddolwr_, _urddawg_: _graddio_, _graddoli_

Grand-ju-ry, _uchelreithwyr_

Grate-ful-ness, _diolchgarwch_

Grat-i-fy, _boddhau_; _gwobrwyo_

Grat-i-tude, _diolchgarwch_, _iolwch_

Greed-i-ness, _aingc_, _awch_, _gwangc_

Guar-an-tee, _gwarantydd_: _gwarantu_

Guard-i-an, _gwarchodwr_

Gut-tur-al, _cegaidd_; _garw seiniol_

Gym-nas-tic, _gorchestol_

Hand-i-ly, _yn hylaw_, _yn fedrus_

Hand-ker-chief, _cadach_, _llawfoled_

Har-mo-ny, _cynghanedd_, _cysondeb_

Heart-i-ly, _yn galonog_; _o'r galon_

Heav-en-ly, _nefolaidd_, _nefawl_

Heav-i-ly, _yn drwm_, _yn bwysig_

Hem-i-sphere, _haner pelen_, _arddrych_

Hence-for-ward, _bellach_, _rhagllaw_

Hep-ta-gon, _seithochrog_

Here-af-ter, _ar ol hyn_, _wedi hyn_, _rhagllaw_

Her-e-sy, _geulith_, _geugred_, _heresi_

Her-it-age, _etifeddiaeth_, _treftadaeth_

Hes-i-tate, _ammeu_, _petruso_

Hex-a-gon, _chwechochrog_

Hi-ber-nal, _gauafaidd_

Hid-e-ous, _hyll_, _erchyll_

High-mind-ed, _uchelfrydig_, _trahaus_

Hin-der-ance, _rhwystr_, _lludd_

His-to-ry, _hanes_, _hanesyddiaeth_

Hith-er-to, _hyd yma_, _hyd yn hyn_

Hom-i-ly, _byrdraith_

Hon-est-y, _uniondeb_; _rhin_

Ho-ri-zon, _terfyngylch_, _gorwel_

Hor-ri-ble, _erchyll_, _ofnadwy_

Horse-man-ship, _marchwriaeth_

Hos-pi-tal, _ysbytty_, _clafdy_

How-be-it, _er hyny_, _er hyn oll_

Hu-man-kind, _dynolryw_

Hu-mor-ous, _penchwiban_; _digrif_

Hur-ri-cane, _hyrddwynt_, _corwynt_

Hus-band-man, _arddwr_, _amaethydd_

Hus-band-ry, _llafuriaeth_, _amaethyddiaeth_

Hy-drau-lics, _awelliaeth_

Hy-dro-gen, _ulai_

Hyp-o-crite, _rhagrithiwr_

I-ci-cle, _cloyn ia_, _cloch ia_

I-de-a, _meddylddrych_; _amgyffred_

Id-i-om, _ieithwedd_

Id-i-ot, _hurtyn_, _gwirionyn_

I-dle-ness, _segurdod_, _diogi_

Ig-no-ble, _anenwog_, _gwael_

Ig-no-rance, _anwybodaeth_, _annysg_

Ig-no-rant, _anwybodus_, _anhyddysg_

Il-le-gal, _anghyfreithlawn_

Il-lic-it, _anghyfreithlawn_, _annheg_

Ill-na-ture, _drwg dymher_

Il-lus-trate, _gloywi_; _egluro_, _amlygu_

Im-ag-ine, _dychymmygu_, _tybio_

Im-be-cile, _diallu_, _dirym_, _egwan_

Im-burse-ment, _cost_, _traul_

Im-i-tate, _dynwared_, _efelychu_

Im-mi-nent, _cyfagos_; _bygythiol_

Im-mod-est, _aflednais_; _anniwair_

Im-mor-al, _anfoesol_, _anfucheddol_

Im-mor-tal, _anfarwol_, _didrangc_

Im-par-tial, _diduedd_, _anmhleidgar_

Im-pa-tience, _diamyneddgarwch_

Im-pa-tient, _diamynedd_, _anoddefgar_

Im-peach-ment, _cyhuddgwyn_: _achwyn_; _attalfa_

Im-per-fect, _anmherffaith_, _diffygiol_

Im-pli-cate, _cymhlethu_; _cydgynnwys_

Im-plic-it, _cuddgasgliadol_; _diymchwiliad_

Im-port-ance, _pwys_; _cynnwysiad_, _ystyr_

Im-port-ant, _pwysfawr_, _dirfawr_

Im-pos-tor, _twyllwr_, _hudwr_

Im-pos-ture, _twyll_, _hudwaith_

Im-po-tent, _analluog_, _dinerth_

Im-pre-cate, _deisyfu drwg_, _rhegu_

Im-pres-sion, _argraffiad_; _argraff_

Im-pris-on, _carcharu_, _caethiwo_

Im-prop-er, _anghymwys_, _anaddas_

Im-prove-ment, _diwygiad_, _gwelliant_

Im-pru-dence, _annoethineb_, _ffoledd_

Im-pru-dent, _anghall_, _anhybwyll_

Im-pu-dence, _digywilidd-dra_

Im-pu-dent, _haerllug_, _digywilidd_

Im-pul-sion, _ffwyrad_, _gyrawd_

Im-pul-sive, _dirgymhellawl_

In-car-nate, _mewn cnawd_

In-cen-tive, _cynhyrfiad_; _cynnyrfiol_

In-ces-sant, _dibaid_, _didor_

In-ci-dence, _damwain_, _dygwyddiad_

In-ci-dent, _damweiniol_

In-cis-ion, _haciad_, _toriad_

In-cite-ment, _annogiad_

In-cle-ment, _gerwin_, _afrywiog_

In-com-mode, _rhwystro_

In-com-pact, _anghryno_

In-com-plete, _anghyfan_, _anghwbl_

In-cor-rect, _anghywir_, _gwallus_

In-cor-rupt, _anllygredig_, _dilwgr_

In-cu-bate, _dëor_

In-cum-bent, _perchenog bywiolaieth_

In-cur-sion, _ymgyrch_, _rhuthdaith_

In-debt-ed, _dyledus_; _rhwymedig_

In-de-cent, _anweddaidd_, _anhardd_

In-dent-ure, _celrwymiad_

In-di-cate, _dangos_, _mynegi_

In-dict-ment, _cyhudd_, _cyhuddgwyn_

In-di-gence, _angenoctyd_, _tlodi_

In-di-gent, _angenus_, _tlawd_

In-dig-nant, _digllawn_, _ffromddig_

In-di-rect, _anghyfeiriol_; _annheg_

In-dis-creet, _anghall_, _ansynwyrol_

In-dis-pose, _anaddasu_; _annhueddu_

In-dis-tinct, _aneglur_, _anhyglyw_

In-do-lence, _seguryd_, _diogi_

In-do-lent, _swrth_, _dioglyd_

In-duce-ment, _annogaeth_; _cymhelliad_

In-dul-gence, _anwes_; _cyd-ddygiad_; _tynerwch_

In-dul-gent, _anwesgar_; _trathyner_

In-dus-try, _diwydrydd_, _dyfalwch_

In-fam-ous, _gwaradwyddus_, _gwarthus_

In-fa-my, _anair_, _enllib_, _gwaradwydd_

In-fan-cy, _mabandod_, _mebyd_

In-fant-ry, _milwyr traed_; _peddyd_

In-fec-tion, _llwgr_, _haint_

In-fec-tious, _heintus_, _adwythig_

In-fer-ence, _casgliad_

In-fer-nal, _uffernol_, _dieflig_

In-fi-del, _anffyddiwr_; _anffyddiog_

In-fi-nite, _anfeidrol_, _annherfynol_

In-flec-tion, _plygiad i mewn_; _croesogwyddiad_

In-flic-tion, _cosproddiad_, _dial_

In-flu-ence, _dylanwad_: _dylanwadu_

In-form-er, _hysbyswr_; _achwynnwr_

In-fringe-ment, _trawsdoriad_, _toriad_

In-fu-sion, _tywalltiad_, _mwydiad_

In-fu-sive, _trwythol_, _mwydol_

In-hab-it, _cartrefu_, _cyfanneddu_

In-her-ence, _glyniad_, _ymlyniad_

In-her-ent, _cynenid_; _dwfnlynol_

In-her-it, _etifeddu_; _meddiannu_

In-hu-man, _creulawn_, _annynol_

In-jec-tion, _chwistrelliad i fewn_

In-i-tial, _dechreuol_, _egwyddorol_

In-i-tiate, _egwyddori_; _derbyn i fewn_

In-junc-tion, _gorchmmyn_, _archiad_

In-ju-ry, _cam_, _sarhad_, _niwed_

In-jus-tice, _anghyfiawnder_, _cam_

In-ner-most, _nesaf i fewn_

In-no-cence, _diniweidrwydd_

In-no-cent, _diniweid_, _dieuog_

In-qui-ry, _ymofyniad_, _chwiliad_

In-ser-tion, _gosodiad i fewn_

In-sin-cere, _anghywir_, _rhagrithiol_

In-sip-id, _diflas_; _merf_

In-si-tion, _impiad_, _imp_

In-so-lence, _trahausder_, _gorhyfder_

In-so-lent, _haerllug_, _taeog_

In-sol-vent, _methdalwr_

In-so-much, _yn gymaint_, _gan_; _hyd oni_, _fel_, _nes_

In-spec-tion, _gorucholygiad_

In-spect-or, _golygwr_, _goruchwyliwr_

In-stal-ment, _urddiad_; _rhan daliad_

In-stant-ly, _yn daer_, _yn ddyfal_; _yn ddioed_

In-sti-gate, _cynhyrfu_, _annog_

In-sti-tute, _egwyddor_; _gosodedigaeth_: _gosod_, _sefydlu_; _addysgu_

In-struc-tion, _addysg_, _hyfforddiad_

In-stru-ment, _peiriant_, _offeryn_

In-su-late, _ynysu_

In-sult-ing, _diystyrllyd_, _gwatwarus_

In-sur-ance, _diogeliad_, _digollediad_

In-sur-gent, _gwrthryfelwr_

In-te-ger, _cyfanrif_, _cyfangorff_

In-te-gral, _symawl_, _cyfan_

In-tel-lect, _deall_, _dealltwriaeth_; _synwyr_

In-ten-tion, _amcan_, _bwriad_

In-ter-cede, _myned rhwng_; _cyfryngu_

In-ter-cept, _rhwystro_, _attal_

In-ter-course, _rhyddrediad_; _cydgyfeillach_

In-ter-dict, _gwahardd_; _esgymuno_

In-ter-est, _budd_, _elw_; _llog_: _cynhyrfu_; _bod mewn gofal_

In-ter-fere, _cyfryngu_, _ymyru_

In-ter-im, _cyfamser_, _cyfrwng_

In-ter-line, _rhwnglinellu_

In-ter-lude, _coegchware_

In-ter-ment, _claddiad_, _claddedigaeth_

In-ter-mit, _dyspeidio_, _peidio_

In-ter-mix, _cymmysgu_, _cydgymmysgu_

In-ter-nal, _mewn_, _o fewn_

In-ter-pose, _myned rhwng_, _cyfryngu_

In-ter-pret, _dehongli_; _cyfieithu_

In-ter-sect, _cynghroesi_

In-ter-val, _cyfrwng_; _hamdden_

In-ter-vene, _cyfryngu_, _dyfod rhwng_

In-ter-view, _cyfrwch_, _ymgyfarfod_

In-test-ate, _heb ewyllys_, _anghymyn_

In-tes-tine, _tufewnol_, _cartrefol_

In-tes-tines, _ymysgar_, _perfedd_

In-ti-mate, _cyfaill_; _cyfeillgar_: _arwyddo_

In-trep-id, _gwrol_, _diofn_, _eon_, _hy_

In-tri-cate, _dyrys_, _rhwystrus_

In-trin-sic, _priodol_, _hanfod_, _cymmwynol_

In-tro-duce, _arwain i fewn_

In-tru-sion, _ymwthiad_, _gormesiad_

In-va-lid, _methfilwr_, _un methedig_; _gwan_, _dirym_

In-va-sion, _rhuthrgyrch_, _ymosodiad_

In-va-sive, _traisruthrol_, _rhuthrol_

In-vei-gle, _twyllo_, _llithio_, _hudo_

In-ven-tion, _dyfais_, _darfeddyliad_

In-vest-ment, _gwisgad_; _urddiad_; _gwarchead_

In-un-date, _llifeirio a dwfr_, _gorlifo_

Ir-ri-gate, _dyfrhau_; _dyfru_

Ir-ri-tate, _ystuno_, _herio_, _cynhyrfu_

It-er-ate, _ailddywedyd_

Jeal-ous-y, _eiddigedd_; _drwgdyb_

Jeop-ard-y, _perygl_, _enbydrwydd_

Jour-ney-man, _hurweithiwr_

Jo-vi-al, _digriflon_, _llon_

Joy-ful-ness, _lloniant_, _llawenydd_

Ju-bi-lee, _gwyl gyhoedd_, _Jubili_

Ju-di-cious, _call_, _deallus_, _synwyrol_

Judg-ment-seat, _gorsedd barn_

Jus-ti-fy, _cyfiawnhau_, _dieuogi_

Ju-ve-nile, _mabin_, _ieuengaidd_

Kid-nap-per, _lleidr personau_

La-bi-al, _gwefusawl_, _gweflol_

La-bour-er, _gweithiwr_, _ymboenwr_

La-bour-ing, _yn ymboeni_, _yn ymegnio_

Lab-y-rinth, _bachdrofa_

Lac-er-ate, _rhwygo_, _dryllio_, _darnio_

La-con-ic, _byreiriog_, _talfyr_

La-i-ty, _llëygion_, _gwyr llëyg_

Land-hold-er, _tirddaliwr_

Lar-ce-ny, _lladrad_, _chwiwladrad_

Lat-i-tude, _lledred_, _llydander_

Lat-ter-ly, _yn ddiweddar_

Laud-a-ble, _canmoladwy_, _gwiwglod_

Laugh-a-ble, _chwerthinus_, _digrifol_

Law-ful-ness, _cyfreithlondeb_

Lax-a-tion, _rhyddhad_, _llacâd_

Lax-i-ty, _rhyddni_, _y dolur rhydd_

La-zi-ness, _diogi_; _seguryd_

Leg-a-cy, _cymynrodd_

Le-ga-tion, _cenadwriaeth_

Leg-i-ble, _darllenadwy_; _eglur_

Leg-is-late, _gwneud deddfau_

Le-ni-ent, _tyner_, _esmwyth_

Lep-ro-sy, _gwahanglwyf_

Leth-ar-gy, _yr hunglwyf_, _gorchwsg_

Li-a-ble, _darostyngedig_, _rhwymedig_

Lib-er-al, _hael_; _rhydd_, _diragfarn_

Lib-er-ate, _rhydhau_, _gollwng_

Lib-er-tine, _un penrydd_; _anghrefyddol_

Lib-er-ty, _rhyddid_, _braint_; _hyfder_

Li-bra-ry, _llyfrgell_, _llyfrgrawn_

Li-cen-tious, _penrydd_, _afreolus_

Lieu-ten-ant, _rhaglaw_

Lig-a-ment, _rhwymyn_, _gïeuyn_

Like-li-hood, _tebygoliaeth_

Lin-e-age, _ach_, _llinach_, _hil_

Liq-uid-ate, _toddi_; _lleihau_

Lit-er-al, _llythrenol_

Lit-ur-gy, _gweddi_, _ffurf o weddiau_

Live-li-hood, _bywiolaeth_, _cynnaliaeth_

Log-a-rithm, _dirprwyn_

Lo-gi-cian, _rhesymegwr_, _dadleuydd_

Lon-gi-tude, _hirder_, _hydred_

Lo-qua-cious, _siaradus_, _tafodrydd_

Lot-ter-y, _cwtws_; _damweiniaeth_

Love-li-ness, _hawddgar_

Lov-ing-ly, _yn hawddgar_

Loy-al-ty, _ffyddlondeb_, _cywiredd_

Lu-cra-tive, _ennillfawr_, _maelfawr_

Lu-di-crous, _digrifol_, _ysmala_

Lum-ba-go, _llwynwst_

Lu-min-ous, _goleu_, _goleufawr_

Lu-na-cy, _lloerawl_, _lleuadol_

Lu-na-tic, _lloerigyn_; _lloerig_

Lux-u-ry, _gloddest_, _rhysedd_

Mac-er-ate, _teneuäu_; _mwydo_

Mag-a-zine, _arfdy_, _ystordy_

Ma-gi-cian, _swynwr_, _dewin_

Mag-is-trate, _swyddog_, _heddynad_

Mag-ni-fy, _mawrygu_, _mwyhau_

Mag-ni-tude, _maint_, _mawrdra_

Maid-ser-vant, _gwasanaethferch_

Main-te-nance, _cynnaliaeth_

Ma-jes-ty, _mawrhydi_

Mal-a-dy, _clefyd_, _dolur_

Mal-con-tent, _gwrthryfelwr_; _anfoddog_

Ma-li-cious, _cenfigenus_, _dygasog_

Ma-lig-nant, _athryfgar_, _anianddrwg_

Man-a-cle, _llawhual_, _llawethar_

Man-age-ment, _llywiadaeth_, _trefniad_

Man-a-ger, _trefnwr_, _rheolwr_

Man-ci-pate, _caethiwo_; _trosi meddiant_

Man-i-fest, _elgur_, _goleu_: _amlygu_, _dangos_

Man-i-fold, _amryw_, _aml_, _lluosog_

Man-ner-ly, _moesog_, _moesgar_

Ma-nœu-vre, _dyfais_, _cyfrwyswaith_

Man-slaugh-ter, _dynladdiad_

Man-u-al, _llawlyfr_, _perthynol i'r llaw_

Man-u-script, _ysgrifen_; _ysgrifwaith_

Mar-i-time, _morawl_, _arfor_

Mar-in-er, _morwr_, _llongwr_

Mar-tyr-dom, _merthyrdod_

Mar-vel-ous, _rhyfeddol_, _aruthrol_

Mas-cu-line, _gwryw_; _dynol_

Mas-sa-cre, _galanasdra_: _cigyddio_

Mas-ter-ly, _trachywrain_; _meistrawl_

Mas-ti-cate, _dygnoi_, _cnoi_

Ma-ter-nal, _mamaidd_, _mamawl_

Mat-ri-cide, _mamladdiad_

Me-an-der, _dolystumio_; _dolenu_

Meas-ure-ment, _meidraeth_, _mesuriant_

Me-chan-ic, _gallofydd_, _celfyddydwr_; _gallofyddol_, _llawweithiol_

Me-di-ate, _cyfryngol_; _canolaidd_; _cyfryngu_, _eiriol_

Med-i-cal, _meddygol_, _meddyginiaethol_

Med-i-cine, _meddyginiaeth_

Med-i-tate, _myfyrio_, _meddylio_

Me-di-um, _cyfrwng_; _y canol_

Mel-o-dy, _peroriaeth_, _melysgerdd_

Mem-o-ry, _côf_; _coffadwriaeth_

Men-di-cant, _cardotyn_; _cardotlyd_: _cardota_

Me-ni-al, _gwas_, _gweinidog_; _teuluaidd_

Mer-can-tile, _marchnadol_, _masnachol_

Mer-chan-dize, _masnachyddiaeth_: _masnachu_

Mer-ci-ful, _trugarog_, _tosturiol_

Mer-cu-ry, _Mercher_; _arian byw_

Mer-cy-seat, _trugareddfa_

Mer-ri-ly, _yn llawen_, _yn ddifyrlon_

Mer-ri-ment, _llawenydd_, _digrifwch_

Mes-sen-ger, _cenad_, _negesydd_

Met-a-phor, _traws-symmudiad_

Me-te-or, _awyrdân_, _goruchionen_

Mi-cro-scope, _chwyddwydr_

Mid-sum-mer, _canol haf_, _alban hefin_

Mi-gra-tion, _mudiad_, _symmudiad_

Mi-li-tia, _meiwyr_

Min-er-al, _mŵn_, _mettel_; _mwnawl_

Min-ia-ture, _mân ddarlun_

Min-is-ter, _gweinidog_: _gweini_

Min-is-try, _gweinidogaeth_; _gweinidogion_

Mi-nute-ness, _manylrwydd_

Mir-a-cle, _gwyrth_, _rhyfeddod_

Mis-ap-ply, _cambriodoli_, _camarfer_

Mis-be-have, _camymddwyn_

Mis-chiev-ous, _diriad_, _drygionus_

Mis-er-y, _trueni_, _adfyd_; _gofid_

Mis-for-tune, _anffawd_, _anhap_

Mit-i-gate, _esmwythau_, _lliniaru_

Mod-er-ate, _cymmedrol_, _canolig_: _cymmedroli_; _arafu_

Mod-est-y, _gwylder_, _lledneisrywdd_

Mod-i-fy, _dullio_, _agweddu_

Mod-u-late, _cyweirio llais_

Moi-e-ty, _hanner_, _hannerig_

Mo-ment-ous, _pwysfawr_, _pwysig_

Mo-ment-um, _egni_; _rhuthr_, _gorfod_

Mon-arch-y, _unbenaeth_, _breniniaeth_

Mon-i-tor, _rhybyddiwr_; _cynghorwr_

Mon-u-ment, _cofgolfn_; _beddadail_

Mor-al-ly, _yn foesol_; _yn debygol_

More-o-ver, _ym mhellach_; _heblaw_, _hefyd_

Mor-tal-ly, _yn farwol_, _yn angeuol_

Mort-ga-gee, _arwystlwr_, _echwynwr_

Mor-ti-fy, _marwlygru_, _darostwng_

Moth-er-ly, _mamaidd_, _mamawl_

Mo-tion-less, _digyffro_, _disymmud_

Mov-a-ble, _symmudadwy_

Moun-tain-eer, _mynyddwr_

Mount-ain-ous, _mynyddig_

Mu-ci-lage, _sudd_; _llysnafedd_

Mul-ti-ply, _lliosi_, _lliosogi_

Mul-ti-tude, _lliaws_, _tyrfa_

Mur-der-ous, _llofruddiog_, _gwaedlyd_

Mu-sic-al, _cerddgar_, _cynghaneddol_

Mu-si-cian, _cerddor_, _cynghaneddwr_, _tantwr_

Mu-ta-ble, _anwadal_, _cyfnewidiol_

Mu-ta-tion, _newidiad_, _cyfnewidiad_

Mu-ti-late, _anafu_, _hacru_, _efryddu_

Mu-ti-ny, _terfysg_: _terfysgu_, _gwrthgodi_

Mu-tu-al, _cy_, _cyd_, _cyf_

Mys-ter-y, _dirgelwch_; _cyfriniaeth_

Na-ked-ness, _noethni_, _llymdra_

Nar-ra-tion, _traethiad_, _adroddiad_, _hanes_

Na-tion-al, _cenedlol_; _gwladol_

Nat-u-ral, _anianol_, _naturiol_

Nav-i-gate, _mordwyo_, _llongiadu_

Ne-ga-tion, _nag_, _nacad_, _gwad_

Ne-ga-tive, _nag_, _negyf_: _nacau_, _gomedd_

Neg-lect-ful, _diofal_, _esgeulus_

Neg-li-gence, _anofaledd_, _esgeulusdod_

Neg-li-gent, _esgeulus_, _diofal_

Nerv-ous-ness, _grymusder_; _gwendid_

News-pa-per, _newyddor_, _newyddiadur_

No-bod-y, _neb_, _neb un_, _undyn_

No-ble-man, _dyledawg_, _pendefig_

Noc-tur-nal, _nosddeial_; _nosawl_

No-mad-ic, _bugeiliol_; _crwydrol_

Nom-in-al, _enwawl_; _galwedigol_

Nom-in-ate, _enwi_; _galw_; _penodi_

Non-pa-reil, _peth digymhar_; _argrafflythrenau_

Not-a-ble, _nodadwy_, _hynod_; _gofalus_

No-ti-fy, _hysbyu_, _cyhoeddi_

Nour-ish-ment, _maeth_, _meithriniaeth_, _ymborth_

Nov-el-ty, _newydd-der_, _newydd-dra_

No-vem-ber, _Tachwedd_

Nu-mer-al, _niferol_, _rhifol_

Nu-mer-ate, _rhifianu_, _rhifnodi_

Nu-mer-ous, _rhifiog_, _lliosog_

Nurs-er-y, _maethdy_; _planigfa_

Nu-tri-ment, _maeth_, _lluniaeth_

Nu-tri-tion, _maeth_, _maethiad_

Ob-du-rate, _calongaled_, _anhyblyg_

Ob-e-lisk, _berna_; _bernod_

Ob-jec-tion, _gwrthddadl_, _gwrtheb_

Ob-jec-tive, _gwrthrychawl_

Ob-la-tion, _offrwm_; _rhodd_

Ob-nox-ious, _darostyngiedig_, _beius_

Ob-serv-ance, _parch_; _cadwad_

Ob-so-lete, _anarferedig_, _henaidd_

Ob-sta-cle, _rhwystr_, _attalfa_

Ob-sti-nate, _cildyn_, _cyndyn_, _gwrthnysig_

Ob-struc-tion, _rhwystr_, _lludd_; _tagfa_

Ob-vi-ate, _rhagflaenu_; _rhagod_

Ob-vi-ous, _amlwg_, _eglur_

Oc-ca-sion, _achlysur_; _achos_: _peru_, _achosi_

Oc-cu-py, _meddiannu_; _dal_; _trin_; _defnyddio_

Oc-cur-rence, _damwain_, _dygwyddiad_

Oc-ta-gon, _wythochr_

Oc-ta-vo, _llyfr wythblyg_; _wythblyg_

Oc-to-ber, _Hydref_

O-di-ous, _cas_, _atgas_; _brwnt_

Of-fen-sive, _atgas_, _ffiaidd_; _rhwystrol_

Of-fer-ing, _aberth_, _offrwm_; _offrymiad_

Of-fi-cer, _swyddwr_, _swyddol_

Of-fi-cial, _is-swyddog_; _swyddol_

O-mis-sion, _esgeulusiad_; _gwall_

Om-nis-cience, _hollwybodaeth_

Om-nis-cient, _hollwybodus_

On-er-ous, _llwythfawr_, _trwm_

O-pen-ly, _ar gyhoedd_, _yn amlwg_

Op-er-ate, _gweithredu_; _effeithio_

O-pin-ion, _tyb_, _meddwl_; _mympwy_

Op-pon-ent, _gwrthwynebwr_; _gwrthwynebol_

Op-por-tune, _prydlawn_; _addas_

Op-po-site, _gwrthwyneb_; _cyferbyn_

Op-pres-sion, _gorthrymder_, _gormes_

Op-pres-sive, _gorthrymus_, _treisiawl_

Op-pres-sor, _gorthyrmwr_, _gormeswr_

Op-ta-tive, _dymunedigol_; _dymunadwy_

Op-u-lence, _cyfoeth_, _golud_

Op-u-lent, _cyfoethog_, _goludog_

Or-a-cle, _arma_; _gwr doeth_

Or-a-tion, _araeth_, _arawd_, _parabl_

Or-a-tor, _areithiwr_; _ymadroddwr_

Or-der-ly, _rheolaidd_, _trefnus_, _gweddaidd_

Or-di-nance, _deddf_, _cyfraith_; _rheol_; _gosodiad_

Or-di-nate, _trefnus_: _trefnu_

Or-gan-ic, _organaidd_; _offerynol_

O-ri-ent, _dwyrain_; _dysglaer_

Or-i-gin, _henydd_; _dechreu_; _gwreiddyn_

Or-na-ment, _addurn_; _harddwch_: _addurno_

Or-tho-dox, _iawnffyddiog_, _uniawngred_

Oth-er-wise, _amgen_, _onide_, _yn wrthwyneb_

O-ver-board, _tros y bwrdd_, _i'r mor_

O-ver-cast, _rhy dafl_; _cymylu_

O-ver-charge, _gorlwytho_; _gorofyn_

O-ver-come, _gorchfygu_, _gorchafu_

O-ver-flow, _arlanw_; _gormodedd_: _gorddylifo_

O-ver-head, _yn uchel_, _uchben_

O-ver-lay, _arlethu_, _gorwedd ar_; _gorchuddio_

O-ver-look, _gorwylio_, _goruchwylio_; _esgeuluso_

O-ver-plus, _sarid_, _gwarged_, _rhelyw_

O-ver-sight, _amryfusedd_; _arolygiaeth_

O-ver-spread, _gordaenu_, _gorchwalu_, _gorchuddio_; _taenu_

O-ver-take, _gorddiwedd_, _gorddiwes_, _dal_

O-ver-throw, _dadymchweliad_: _dymchwel_

O-ver-whelm, _gorwasgu_, _llethu_,

Out-ra-geous, _drygwyllt_, _ffyrnig_

Out-ward-ly, _yn allanol_, _oddi allan_

Pa-ci-fy, _dyhuddo_, _tawelu_

Pain-ful-ness, _poenusrwydd_

Pal-a-tine, _breiniog_

Pal-i-sade, _palis_, _gwalc_: _palisio_, _cledrgau_

Pal-pa-ble, _hydeiml_, _eglur_, _amlwg_

Pal-pi-tate, _dychlamu_; _curo_

Par-a-ble, _dammeg_, _ammeg_

Par-a-dise, _paradwys_, _gwynfa_, _nef_

Par-a-dox, _amrydyb_, _amgendyb_

Par-a-graph, _gwahanran_

Par-al-lax, _amgenedigaeth_

Par-al-lel, _cyfochriad_, _cyfatebiad_; _cyfochrol_: _cyfochri_

Par-a-mount, _goruchel_, _uchaf_, _penaf_

Par-a-mour, _cariadfab_, _cariadferch_

Par-a-pet, _canllawfur_, _gwalcfur_

Par-a-phrase, _allair_: _aralleirio_

Pa-rent-al, _rhieniawl_

Par-lia-ment, _senedd_, _seneddr_

Par-tak-er, _cyfranog_, _cyfranogwr_

Par-tial-ly, _yn dueddgar_; _o ran_

Par-ti-cle, _arsill_; _mymryn_; _tip_

Par-ti-tion, _rhaniad_; _canolfur_: _rhanu_

Part-ner-ship, _cyfrannogaeth_, _cydhawiaeth_

Pas-sa-ble, _hyffordd_; _derbyniol_

Pas-sen-ger, _teithydd_, _tramwywr_

Pas-sion-ate, _hyddig_, _nwydwyllt_; _traserchus_

Pass-o-ver, _Y Pasc_

Pas-to-ral, _bugeilgerdd_; _bugeiliaidd_

Pat-en-tee, _braint-lythyrog_

Pat-ri-arch, _prifdad_, _patriarch_

Pat-ron-age, _tadogaeth_; _nawdd_

Pay-a-ble, _dyledus_, _taladwy_

Peace-a-ble, _heddychlawn_; _dystaw_

Pec-to-ral, _dwyfronawl_, _cyllaol_

Pe-cul-iar, _priod_, _priodol_; _enwedigol_

Ped-es-tal, _bôn colofn_

Ped-i-gree, _âch_, _achwedd_

Pel-lu-cid, _tryloyw_, _gloyw_, _claer_

Pen-al-ty, _poen_, _cosp_; _dirwy_

Pen-du-lum, _dibynai_, _dringlyn_

Pen-e-trate, _treiddio_; _amgyffred_

Pen-i-tence, _edifeirwch_, _edifeiriant_

Pen-i-tent, _edifar_, _edifarus_

Pen-man-ship, _ysgrifen ddawn_

Pen-ny-worth, _ceiniogwerth_

Pen-sion-er, _gwobrwas_, _cyflogddyn_

Pen-ta-gon, _pumochr_

Pen-te-cost, _y pentecost_; _y Sulgwyn_

Pen-u-ry, _tlodi_, _anghen_

Per-cep-tion, _gwelediad_; _syniad_

Per-cep-tive, _gwelediannol_; _syniol_

Per-cus-sion, _tarawiad_, _ergydiad_

Per-di-tion, _colledigaeth_, _dystryw_

Per-fec-tion, _perffeithdra_

Per-fect-ly, _yn berffaithgwbl_

Per-fid-ious, _twyllgar_, _bradwrus_

Per-fo-rate, _tyllu_; _trydyllu_

Per-for-mance, _cyflawniad_; _chware_

Per-form-er, _cyflawnwr_, _chwarëydd_

Per-il-ous, _peryglus_, _enbyd_

Pe-ri-od, _gwers_; _cyfnod_; _diweddnod_

Per-ish-ing, _hylwgr_; _darfodedig_

Per-ma-nence, _parhad_

Per-ma-nent, _parhaus_, _sefydlog_

Per-mis-sion, _caniatâd_, _goddefiad_

Per-ni-cious, _niweidiol_, _dinystriol_

Per-pe-trate, _drygweithredu_, _cyflafanu_

Per-qui-site, _adfael_

Per-se-cute, _erlid_, _erlyn_

Per-se-vere, _parhau_, _para_; _dyfal bara_; _aros_

Per-son-al, _dynsodawl_; _personnol_; _perthynol i_

Per-son-ate, _dynwared_; _cynnyrcholi_

Per-spec-tive, _golygawl_, _trylwg_

Per-ti-nence, _cyfaddasrwydd_

Per-ti-nent, _perthynasol_, _cymhwys_

Per-u-sal, _tryddarlleniad_, _darlleniad_

Pes-ti-lence, _heintnod_, _y pla_

Pes-ti-lent, _heintnodawl_, _heintus_

Pe-ti-tion, _erfyniad_, _deiseb_: _erfynio_, _deisyf_

Pet-ri-fy, _caregu_

Pet-u-lance, _crygnaws_; _coegni_

Pet-u-lant, _anniddig_, _anfoddog_

Phar-ma-cy, _cyfferiaeth_

Phys-i-cal, _meddygol_; _anianyddol_

Phy-si-cian, _meddyg_, _meddygydd_

Pi-e-ty, _duwiolfryd_, _duwioldeb_

Pil-grim-age, _pererindod_

Pi-lot-age, _llywiedyddiaeth_

Pin-na-cle, _pinagl_, _uchelfaen_

Pi-ra-cy, _morladrad_, _morysbail_

Pit-e-ous, _truenus_, _tostûrus_

Pit-i-ful, _tosturus_; _gresynol_

Plant-a-tion, _planfa_, _planigfa_

Plas-ter-er, _cymrydwr_, _plastrwr_

Plaud-a-ble, _canmoladwy_, _clodadwy_

Plaus-i-ble, _ymddangosiadus_; _golygus_; _tybygol_

Play-fel-low, _cydchwarëydd_

Plen-te-ous, _llawn_, _helaethlawn_

Plen-ti-ful, _helaeth_, _cyflawn_

Pli-a-ble, _ystwyth_, _hyblyg_

Plun-der-er, _anrheithiwr_, _ysbeiliwr_

Po-et-ry, _awenyddiaeth_, _barddoniaeth_

Poi-son-ous, _gwenwynig_, _gwenwynllyd_

Pol-i-cy, _llywodraethyddiaeth_; _callineb_; _ysgrifen digollediad_

Po-lite-ness, _moesgarwch_, _hyfoesedd_

Pol-it-ic, _cyfrwysgall_; _gwladol_

Pol-it-ics, _llywod-ddysg_, _gwledychddysg_

Pol-lu-tion, _halogiad_, _aflanad_

Pol-y-gon, _amryochr_

Pop-u-lace, _y cyffredin_, _y werin_

Pop-u-lar, _poblogaidd_; _gwerinaidd_

Port-a-ble, _dygadwy_, _hyddwyn_

Port-er-age, _cyflog cludydd_

Port-fol-io, _papyrgwd_

Port-man-teau, _bolgan_; _ysgilgist_

Po-si-tion, _cyflead_, _gosodiad_; _sefyllfa_

Pos-i-tive, _gwiriawl_; _sicr_, _penodol_

Pos-ses-sion, _meddiant_, _perchenogaeth_

Pos-ses-sive, _perchenawl_, _meddawl_

Pos-ses-sor, _meddianydd_; _perchen_

Pos-si-ble, _galluadwy_; _posibl_

Pos-si-bly, _efallai_; _ysgatfydd_

Post-of-fice, _llythyrdy_, _llythyrfa_

Po-ten-tate, _penadur_, _archdeyrn_

Po-ten-tial, _galluogol_, _galluadwy_

Pot-ter-y, _crochenyddiaeth_

Pov-er-ty, _tlodi_, _anghen_, _eisiau_

Poul-ter-er, _adarwerthwr_

Pow-er-ful, _galluog_, _nerthol_

Prac-ti-cal, _ymarferol_, _defnyddiol_

Praise-wor-thy, _canmoladwy_

Pre-cau-tion, _rhagocheliad_: _rhagrybyddio_

Pre-ce-dence, _blaenoriaeth_, _y blaen_

Pre-ce-dent, _cynreol_; _blaenorol_

Prec-i-pice, _dibyn_, _diffwys_

Pre-cis-ion, _manylrwydd_

Pre-cise-ly, _yn fanwl_

Pre-cur-sor, _blaenrhed_, _rhagflaenor_

Pred-i-cate, _adroddawl_, _darddelw_: _darddodi_, _rhagadrodd_

Pre-dic-tion, _rhagddywediad_

Pre-ex-ist, _cynhanfodi_, _cynfodi_

Pref-er-ence, _rhagoriaeth_, _blaenoriaeth_

Pre-fer-ment, _dyrchafiad_, _codiad_

Pre-ju-dice, _rhagfarn_: _niweidio_

Pre-ma-ture, _rhagaddfed_, _rhygynar_

Prem-i-ses, _cyseiliau_, _cysoddedigion_

Pre-mi-um, _gwobr_, _gobr_

Pres-by-ter, _penaduriad_, _hynefydd_

Pre-scrip-tion, _rhagysgrifen_; _cyfarwyddiad_

Pre-serv-er, _cynnaliwr_, _diogelwr_

Pres-i-dent, _arlywydd_, _llywydd_

Pre-sump-tion, _tybygiad_; _beiddiad_

Pre-sump-tive, _tybiadol_; _trahaus_

Pre-tend-er, _ffuantwr_, _twyllhonwr_

Pre-ten-sion, _rhith-hawliad_

Pre-vail-ing, _ffyniannus_, _tyciol_

Prev-a-lence, _ffyniant_, _goruchafiaeth_

Prev-a-lent, _gorchfygawl_, _ffynawl_

Pre-ven-tion, _rhagflaeniad_; _lluddiad_

Pre-ven-tive, _cadwedydd_, _rhagflaenydd_; _rhagflaenedigol_

Pre-vi-ous, _blaenorol_, _rhag blaen_, _cyn_

Pri-ma-ry, _prif_, _cysefin_, _gwreiddiol_; _cyntaf_

Prim-i-tive, _cyntefig_, _cysefin_; _prif_

Prin-ci-pal, _pen_, _blaenor_; _prif_, _penaf_

Prin-ci-ple, _egwyddor_; _gosodedigaeth_: _egwyddori_; _dysgu_

Pri-va-cy, _dirgelwch_; _cyfrinach_

Pri-va-teer, _herwlong_

Priv-i-lege, _braint_, _gorfraint_: _breinio_

Priv-i-ly, _yn ddirgel_, _tan gel_

Prob-a-ble, _tebyg_, _credadwy_, _hygoel_

Pro-ba-tion, _prawf_, _profiad_

Pro-ced-ure, _hwyliad_, _gyriad_

Pro-ceed-ing, _gweithrediad_, _gorchwyl_

Pro-ces-sion, _gorymdaith_, _torfdrefnus_

Prod-i-gal, _afradlawn_, _dyfethgar_

Pro-dig-ious, _aruthrol_, _dirfawr_; _rhyfeddol_

Pro-duc-tion, _cynnyrchiad_; _estyniad_

Pro-duc-tive, _cynnyrchiol_; _ffrwythiannus_

Pro-fane-ness, _halogrwydd_; _llygredigaeth_

Pro-fes-sion, _proffesiad_; _galwedigaeth_

Pro-fes-sor, _proffeswr_; _cadeirdraw_

Pro-fi-cience, _cynnydd_; _gwelliant_

Pro-fi-cient, _un cynnyddedig_; _graddwr_

Prof-li-gate, _oferddyn_; _anfad_, _dirinwedd_

Pro-fu-sion, _gorhaeledd_, _gormodedd_

Prog-e-ny, _hil_, _epil_

Pro-gres-sion, _mynediad ym mlaen_; _graddiant_, _cynnyddiad_

Pro-gres-sive, _graddringawl_, _graddol_

Pro-hib-it, _gwarafun_, _gwahardd_

Pro-jec-tile, _tafledigydd_, _taflbeth_; _hydafl_, _tafl_

Pro-jec-tion, _ergydiad_, _cynlluniad_; _ysgwyddiad_

Pro-lif-ic, _hiliog_, _epiliog_, _ffrwythlawn_

Prom-e-nade, _rhodfa_, _rhodfa awelaidd_

Prom-i-nence, _ysgwyddiad allan_, _crogiad allan_; _bargodle_

Prom-i-nent, _bargodawl_, _eglur_; _amlycaf_

Prom-is-ing, _gobeithlawn_, _gobeithiol_

Pro-mo-tion, _dyrchafiad_, _codiad_

Promp-ti-tude, _parodrwydd_; _hyfedredd_

Pro-mul-gate, _cyhoeddi_, _adrodd hysbysu_

Prop-a-gate, _epilio_, _cenedlu_, _lluosogi_

Prop-er-ly, _yn briodol_, _yn addas_

Prop-er-ty, _cynneddf_, _priodolder_; _eiddo_, _meddiant_

Proph-e-cy, _prophwydoliaeth_

Proph-e-sy, _prophwydo_, _rhagfynegi_

Pro-pi-tious, _tosturiol_, _graslawn_; _ffafriol_

Pro-por-tion, _cyfran_, _dogn_; _cyfartalwch_: _cymmedroli_; _cyweirio_

Pros-e-cute, _arganlyn_, _dilyn_, _erlyn_, _erlid_

Pros-e-lyte, _dychwelwr_: _dychwelyd_

Pros-o-dy, _mydryddiaeth_; _acenyddiaeth_

Pro-spec-tus, _rhagdremyn_

Pros-per-ous, _llwyddiannus_, _hylwydd_

Pros-ti-tute, _putain_: _puteinio_

Pros-tra-tion, _gorchreiniad_, _iseliad_

Pro-tec-tion, _amddiffyniad_, _nodded_

Pro-tec-tor, _amddiffynydd_

Prot-es-tant, _gwrthdystiwr_; _ardystiwr_

Pro-to-col, _cynysgrif_

Pro-trac-tion, _gohiriad_, _oediad_

Pro-tru-sion, _gwithiad ym mlaen_

Prov-a-ble, _profadwy_, _hybrawf_

Prov-en-der, _ebran_, _porthiant_

Prov-i-dence, _rhagwelediad_, _rhagluniaeth_

Prov-i-dent, _darbodus_; _cynghorus_

Pro-vin-cial, _taleithben_; _taleithiol_, _gwladol_

Pro-vi-sion, _arlwy_, _lluniaeth_; _darpariaeth_

Prox-i-mate, _nesaf_, _agosaf_, _digyfrwng_

Pru-den-tial, _cynghorus_, _call_

Pub-lish-er, _cyhoeddwr_; _adroddwr_

Pu-gil-ist, _dyrnodiwr_, _paffiwr_

Pug-na-cious, _ymladdgar_

Pul-mon-ic, _ysgyfain_, _ysgyfeinglaf_

Pul-sa-tion, _curiad_; _ysbongciad_

Pul-ver-ize, _llychu_, _malu_

Punc-tu-al, _geirwir_; _manol_; _gofalus_

Pun-ish-ment, _cosp_, _cospedigaeth_

Pur-ga-tive, _carthai_; _carthedigol_

Pu-ri-fy, _coethi_, _puro_

Pu-ri-ty, _purdeb_, _puredd_

Pur-loin-er, _darnguddiwr_

Pur-su-ance, _canlyniad_, _erlyniad_

Pur-vey-ance, _porthmonaeth_

Pu-tre-fy, _braenu_, _pydru_

Pu-tres-cence, _malldod_, _pydredd_

Pu-tres-cent, _braenllyd_, _llygredig_

Pu-trid-ness, _braenedd_

Pyr-a-mid, _bera_

Quad-ran-gle, _pedror_, _pedrongl_: _pedrongli_

Quad-rat-ic, _pedryradd_, _pedraidd_

Quad-ru-ped, _pedwartroed_

Quad-ru-ple, _pedwarplyg_

Qual-i-fy, _addasu_, _cymhwyso_

Qual-i-ty, _cynneddf_; _rhinwedd_; _ansawdd_; _rhywogaeth_

Quan-ti-ty, _swm_, _maint_

Quar-an-tine, _diheinbrawf_

Quar-rel-some, _cwerylus_, _cecrus_

Quar-ter-deck, _uchelfwrdd_, _pedryfwrdd_

Quar-ter-ing, _dofreithiad_; _llettyad_

Quar-ter-ly, _yn drimisol_

Quench-a-ble, _diffoddadwy_

Quest-ion-ing, _posiad_, _ymfoyniad_

Quick-sil-ver, _arian byw_

Qui-et-ness, _llonyddwch_, _tawelwch_

Quo-ta-tion, _dyfyniad_, _dyfynnodiad_

Ra-di-ance, _llewyrch_, _gloywder_

Ra-di-ant, _dysglaer_, _pelydrog_

Ra-di-ate, _pelydru_, _peilio_

Rad-i-cal, _gwreiddiol_, _cyn_, _cysefin_

Rad-i-cate, _gwreiddio_; _boneddogi_

Ra-di-us, _gwawlbaladr_, _hanner tryfesur_

Rag-ged-ness, _carpiogrwydd_

Rag-ing-ly, _yn gynddeiriog_, _yn ffyrnig_

Rail-ler-y, _difenwad_, _gwawdfeiad_, _gogan_

Ran-som-er, _prynwr_, _pryniadwr_

Ra-pa-cious, _rheibus_, _gwangcus_

Ra-pid-ly, _yn gyflym_, _yn fuan_

Rap-tu-rous, _perlewygawl_; _gorllawen_

Rar-e-fy, _teneuo_, _teneuaw_

Ras-cal-ly, _brwnt_, _gwael_, _dyhir_

Ra-tion-al, _rhesymol_, _arbwyllawg_

Rav-en-ous, _gorwangcus_, _cigfranawl_

Ra-vish-ment, _treisiant_; _gorlonedd_

Read-i-ly, _yn barod_, _yn ewyllysgar_

Read-i-ness, _parodrwydd_, _ewyllysgarwch_

Re-ad-mit, _aildderbyn_, _ad-dderbyn_

Re-al-ize, _gwirio_, _sylweddoli_; _gwirbrofi_

Re-al-ly, _yn wir_; _yn ddiau_

Re-as-cend, _adesgyn_

Rea-son-er, _rhesymwr_

Rea-son-ing, _rhesymiad_, _cymhwylliad_

Re-bate-ment, _rhigoliad_, _toliant_

Re-bell-ion, _gwrthryfel_

Re-bell-ious, _gwrthryfelgar_, _cyndyn_

Re-ceiv-er, _derbyniwr_, _derbynydd_

Re-cent-ly, _yn newydd_, _yn ddiweddar_

Re-cep-tion, _derbyniad_, _croesaw_

Re-cit-al, _adroddiad_, _datgan_

Re-cit-ing, _adroddiad_, _mynegiad_

Reck-on-ing, _cyfrifiant_, _cyfrif_

Re-cog-nize, _adwaen_, _adnabod_

Rec-ol-lect, _ailgynnull_, _adgofio_

Re-com-mence, _ailddechreu_

Rec-om-mend, _canmol_; _gorchymmyn_

Rec-om-pense, _atdal_, _tâl_, _taledigaeth_: _atdalu_, _gwobrwyo_

Rec-on-cile, _cymmodi_; _heddychu_

Re-cord-er, _cofiadur_, _cofrestrydd_

Re-cre-ate, _adfywio_, _adloni_

Rect-an-gle, _unionongl_, _cyfongl_

Rec-ti-fy, _unioni_, _diwygio_; _ad-ddystyllio_

Rec-ti-tude, _uniondeb_, _uniawnedd_

Rec-tor-y, _personiaeth_, _Persondy_

Re-cum-bent, _gorweddol_

Re-cur-rence, _dychweliad_, _adrediad_

Re-cur-rent, _dychweliadol_, _adgyrchiol_

Re-deem-er, _prynwr_, _gwaredwr_

Re-demp-tion, _pryniad_, _prynedigaeth_

Re-duc-tion, _goresgyniad_, _cwtogiad_

Re-dun-dance, _arddigonedd_, _gormodedd_

Re-dun-dant, _arddigonawl_, _gormodawl_

Re-em-bark, _adlongi_

Re-en-force, _adgyfnerthu_, _adrymuso_

Re-en-gage, _ailymrwymo_

Ref-er-ence, _cyfeiriad_, _golygiad_

Re-fine-ment, _coethiad_; _manyliant_

Re-flec-tion, _gwrthdafliad_; _adfyfyriad_

Re-flect-ive, _adlewyrchol_; _adfyfyriol_

Re-form-er, _diwygiwr_, _adffurfiwr_

Re-frac-tion, _dadlewyrch_; _gwrthdoriad_

Re-fract-ive, _gwrthdoredigol_

Re-fresh-ment, _adfywiad_, _lluniaeth_

Ref-u-gee, _ymnoddwr_, _ymnoddiedydd_

Re-fus-al, _pall_, _gomeddiad_

Re-gard-ful, _ystyriol_, _gofalus_

Re-gard-less, _anystyriol_, _diofal_

Re-gen-cy, _rhaglawiaeth_

Reg-i-cide, _teyrnladdiad_

Reg-i-men, _hwyl_, _rheoldrefn_; _trefniad ymborth_

Reg-i-ment, _catrawd_, _byddinrawd_

Reg-is-ter, _coflyfr_, _cofrestrwr_: _cofrestru_, _cofnodi_

Reg-is-trar, _cofrestrwr_

Reg-u-lar, _rheolaidd_, _trefnus_

Reg-u-late, _trefnu_, _rheoleiddio_

Re-hears-al, _adroddiad_, _datganiad_

Re-ject-ed, _gwrthodedig_, _llysedig_

Re-jec-tion, _gwrthodiad_, _llysiant_

Re-im-burse, _atdalu_, _talu yn ol_

Re-joic-ing, _llawenychiad_, _gorfoledd_, _llawenydd_

Re-la-tion, _adroddiad_, _mynegiad_; _perthynas_

Rel-a-tive, _perthynas_; _perthynasol_

Re-lent-less, _didosturi_, _caledgalon_

Re-li-ance, _golud_, _ymddiried_; _dibyniad_

Re-lig-ion, _crefydd_

Re-lig-ious, _crefyddol_

Re-lin-quish, _gadw_, _gadael_, _gollwng_

Rel-ish-ing, _archwaethiad_, _blasiad_

Re-luct-ance, _gwrthdyniad_, _anfodd_

Re-luct-ant, _anewyllysgar_, _anfoddog_

Re-main-der, _gweddill_, _rhan ar ol_; _gadawedig_

Rem-e-dy, _meddyginiaeth_, _gwelliant_

Re-mem-ber, _cofio_, _meddwl_; _adgoffa_

Re-mem-brance, _cof_, _adgof_; _coffadwriaeth_

Re-mis-sion, _maddeuant_, _dilead_

Re-mit-tance, _arian troslwydd_, _adanfoniad_; _maddeuant_

Re-mit-ting, _dyspeidiol_

Re-mon-strance, _adfynegiad_, _gwrthdystiad_

Re-mon-strate, _gwrthachwyn_, _gwrthresymu_

Re-mote-ness, _pellder_

Re-mov-al, _symmudiad_; _diswyddiad_

Ren-dez-vous, _ymgyrchfa_, _ymgasglfa_

Ren-e-gade, _gwrthgiliwr_

Re-new-al, _adnewyddiad_

Ren-o-vate, _adnewyddu_; _adferu_

Rent-a-ble, _ardrethadwy_

Re-pay-ment, _atdal_, _atdaliad_

Re-peat-er, _adroddwr_; _oriadur_

Re-pent-ance, _edifeirwch_, _edifeiriant_

Re-plen-ish, _diwallu_, _llenwi_

Re-port-er, _hysbyswr_, _mynegwr_

Rep-re-sent, _arddangos_, _cynnyrchioli_

Rep-ri-mand, _cerydd_: _ceryddu_

Re-proach-ful, _edliwgar_; _gwaradwyddus_

Rep-ro-bate, _drygddyn_: _gwrthod_

Re-pub-lic, _gweriniaeth_

Re-pug-nance, _gwrthwynebiad_

Re-pug-nant, _gwrthwyneb_, _croes_

Re-pul-sion, _gwrthyriad_

Re-pul-sive, _cilgwthiol_

Re-put-ed, _cyfrifedig_

Re-qui-site, _gofynedig_, _angenrheidiol_

Re-qui-sites, _angenrheidiau_

Re-quit-al, _gwobr_; _iawn_, _tâl_

Re-sem-blance, _cyffelybrwydd_

Re-sem-ble, _tebygu_, _cyffelybu_

Re-sent-ment, _atdeimlad_; _digter_

Res-er-voir, _cronfa_, _dyfrgist_

Res-i-dence, _arosfa_, _trigfa_, _cartref_

Res-i-dent, _trigiannydd_; _trigiannol_

Res-i-due, _gweddill_, _rhelyw_

Re-sist-ance, _gwrthwynebiad_

Re-solv-ent, _datodawl_

Res-o-lute, _llawnfrydig_, _bwriadlawn_

Re-spect-ful, _parchus_, _parchlawn_

Re-spec-tive, _neillduol_, _priodol_, _gwahanol_

Re-splen-dence, _atdywyniad_, _dysglaerder_

Re-splen-dent, _llewyrchol_, _ysblenydd_

Re-stric-tion, _attaliad_, _cyfyngiad_

Re-stric-tive, _terfynedigol_, _rhwymol_

Re-strin-gent, _rhwymydd_; _rhwymol_

Re-tain-er, _llogwr_; _dibynydd_

Re-ten-tion, _attaliad_, _cofddaliad_

Re-ten-tive, _attalgar_, _cynnwyssol_; _gafaelgar_

Ret-i-nue, _gosgordd_, _gosgorddlu_

Re-tire-ment, _neillduedd_, _unigedd_

Re-trench-ment, _cwtogiad_; _adglawdd_

Ret-ro-grade, _gwrthgrwydrol_

Ret-ro-spect, _gwrthedrych_, _adolwg_

Re-venge-ful, _dialgar_, _ymddialgar_

Rev-e-nue, _ardreth_, _cyllid_

Rev-er-ence, _parch_, _anrhydedd_: _perchi_, _parchu_

Rev-er-end, _parchedig_, _hybarch_

Rev-er-ent, _parchus_; _gostynedig_

Re-vers-al, _dymchweliad_, _diddymiad_

Re-ver-sion, _gwrthdroad_; _olyniad_

Re-vi-sion, _adchwyliad_, _ailolygiad_

Re-viv-al, _adfywiad_, _dadebriad_

Re-volv-ing, _amdroad_; _myfyriad_

Re-ward-ed, _gwobrwyedig_

Rhet-o-ric, _ffraetheb_, _areithyddeg_

Rheu-ma-tism, _cryd cymalau_, _cymalwsg_

Rid-i-cule, _gwawd_: _gwawdio_

Right-eous-ness, _cyfiawnder_, _uniondeb_

Rig-or-ous, _garw_, _gerwin_, _llymdost_

Ring-lead-er, _blaenor_, _penaeth_

Ri-ot-ous, _terfysgus_

Rit-u-al, _defodlyfr_; _defodol_

Ri-val-ry, _cydymgais_

Riv-u-let, _nant_, _cornant_

Ro-ga-tion, _gofyniad_, _gwedd_

Ro-man-tic, _aruthrol_; _ffugiol_

Ro-ta-tion, _chwyliad_, _chwyldroad_

Roy-al-ty, _brenindod_, _teyrnogaeth_

Ru-di-ment, _egwyddor_, _cynbrawf_

Ru-in-ate, _andwyo_, _andwyol_

Ru-in-ous, _adfeiliog_, _andwyol_

Ru-mi-nate, _adgnoi_; _adystyried_

Run-a-way, _ffoadur_, _cilgi_

Rus-ti-cate, _gwladogi_

Rust-i-ness, _llwydni_, _llwydrydni_

Sac-cha-rine, _siwgraidd_; _melys_

Sac-ra-ment, _sacrament_

Sa-cred-ness, _cysegredd_

Sac-ri-fice, _aberth_, _offrwm_: _aberthu_

Sac-ri-lege, _cysegrladrad_

Sa-ga-cious, _call_, _craff_, _synwyrol_

Sal-a-ry, _cyflog_, _tâlwobr_

Sale-a-ble, _gwerthadwy_

Sa-li-va, _aliw_, _poer_

Sal-i-vate, _haliwio_, _poerlif_

Sal-va-tion, _iachawdwriaeth_, _gwaredigaeth_

Sanc-ti-fy, _santeiddio_; _puro_

San-i-ty, _iechyd_, _dianmhwylled_

Sar-cas-tic, _gwawdus_, _brathgar_

Sa-ti-ate, _digoni_, _diwallu_

Sat-el-lite, _seren osgordd_, _lleuaden_

Sat-is-fy, _boddio_; _diwallu_

Sat-u-rate, _llenwi_, _digoni_

Sat-ur-day, _dydd Sadwrn_

Sav-age-ness, _gwylltineb_, _creulonedd_

Sau-ci-ness, _coegni_, _delder_

Scan-dal-ize, _gwaradwyddo_, _goganu_

Scan-dal-ous, _gwaradwyddus_, _gwarthus_

Scen-e-ry, _golygfa_, _darlunfa_

Scrip-tu-ral, _ysgrythyrol_

Scro-fu-la, _manwynion_

Scru-pu-lous, _ammheugar_

Scru-ti-nize, _adchwilio_

Scru-ti-ny, _olrhëawd_, _manwl chwiliad_

Sea-son-ing, _tymheriad_; _cywair_

Se-clu-sion, _cauad allan_, _ysgariad_

Se-cre-cy, _dirgelaidd_, _dirgelwch_

Sec-u-lar, _bydol_, _lleygol_

Se-date-ness, _arafwch_, _digyffroad_

Sed-i-ment, _gwaddod_, _gwaelod_

Se-di-tion, _terfysg_, _ymblaid_

Se-di-tious, _ymbleidgar_, _bradfwriadol_

Se-duc-tion, _hudiad_, _trawsddeniad_

Sed-u-lous, _dyfal_, _diwyd_, _llafurus_

Seem-ing-ly, _i'r golwg_, _mewn rhith_

Se-lec-tion, _detholiad_, _detholrif_

Self-con-ceit, _hunandyb_

Sen-a-tor, _seneddwr_, _henefydd_

Se-ni-or, _hynaf_, _hynefydd_

Sen-sa-tion, _syniad_, _teimlad_

Sen-si-ble, _teimladwy_; _deallus_

Sen-si-tive, _teimladol_; _byw_

Sen-su-al, _anianol_, _cnawdol_

Sen-ti-ment, _tyb_, _barn_, _meddwl_

Sen-ti-nel, _gwyliedydd_

Sep-a-rate, _gwahan_: _gwahanu_

Sep-tem-ber, _Medi_, _mis Medi_

Sep-ul-chre, _bedd_, _beddrod_

Se-ri-ous, _difrif_, _difrifol_

Ser-pen-tine, _sarphaidd_; _dolenog_

Ser-vi-tude, _caethwasanaeth_, _caethiwed_

Set-tle-ment, _sefydliad_, _preswylfod_

Sev-en-fold, _seithblyg_

Sev-er-al, _pwngc_, _pen_; _amryw_, _gwahanol_; _llawer_

Shal-low-ness, _basder_, _basedd_

Shel-ter-ing, _gwasgodiad_, _achlesiad_

Shiv-er-ing, _cryndod_; _dellteniad_

Sid-er-al, _serawl_

Sig-nal-ize, _hynodi_, _enwogi_, _arnodi_

Sig-na-ture, _arwyddnod_, _llaw ysgrifen_

Sig-ni-fy, _arwyddo_; _hysbysu_, _mynegi_

Silk-mer-cer, _sidanydd_

Sil-li-ness, _ffoledd_, _ynfydrwydd_

Sil-ver-smith, _arianof_, _gof arian_

Sim-i-lar, _tebyg_, _mal_, _cyffelyb_

Sim-i-le, _cymhariaeth_, _cyffelybiaeth_

Sim-ple-ton, _symylyn_, _hurtyn_

Sim-pli-fy, _symliaw_, _symlu_

Sin-cere-ly, _yn gywir_, _yn ddiffuant_

Sin-ful-ness, _pechadurusrwydd_

Sin-gle-ness, _symledd_, _symlrwydd_

Sin-gu-lar, _unigol_, _unig_; _hynod_, _neillduol_

Sin-is-ter, _aswy_, _chwith_; _annheg_

Sit-u-ate, _sefydlu_, _cyfleu_

Skel-e-ton, _ysgerbwd_, _esgrud_

Skil-ful-ness, _cywreinrwydd_, _hyfedredd_

Sky-rock-ets, _banbelau_, _tânbeleni_

Slan-der-ing, _athrodiad_, _abseniad_

Slan-der-ous, _enllibus_, _athrodus_

Slaugh-ter-house, _cigydd-dy_, _lladd-dy_

Slip-per-y, _llithrig_; _anhyddal_

Sloth-ful-ness, _diogi_, _musgrellni_

Slov-en-ly, _swga_, _annhaclus_; _dilun_; _yn anghryno_

So-ber-ness, _sobrwydd_; _difrifwch_

So-ci-al, _cymdeithgar_, _cyfeillgar_

Sol-em-nize, _difrifgadw_, _gweinyddu_

So-lic-it, _erfyn_, _crefu_

Sol-i-tude, _unigedd_, _ymneillduedd_

Sol-u-ble, _toddadwy_, _hydawdd_

So-lu-tion, _dattoddiad_; _egluriad_

Some-bod-y, _rhywun_

So-no-rous, _seinfawr_, _soniarus_

Sooth-say-er, _dewin_, _dewinwr_

Soph-is-try, _twyllresymiad_

Sor-cer-er, _swynwr_

Sor-cer-y, _swyngyfaredd_

Sor-row-ful, _trist_, _galarus_

Sov-er-eign, _penllywydd_; _penadur_; _goruchaf_, _goruchel_

South-er-ly, _deheuol_

Spe-cif-ic, _priodfeddyginiaeth_; _priodol_, _neillduol_

Spe-ci-fy, _penodi_, _gwahanodi_

Spe-ci-men, _rhagbrawf_, _cynrych_

Spec-ta-cle, _drych_, _golwg_

Spec-ta-cles, _tremwydr_, _syllwydr_

Spec-ta-tor, _edrychwr_, _syllydd_

Spec-u-late, _brydolygu_, _golygianu_

Spell-ing-book, _silliadur_

Spher-i-cal, _cyfrgrwn_

Spir-it-ed, _ysbrydlawn_, _gwrol_

Spite-ful-ness, _migusedd_, _dygasedd_

Spu-ri-ous, _ffugiol_, _bastarddaidd_

Sta-ble-ness, _diysgogrwydd_

Staff-bear-er, _brysgyllddygydd_

Stag-na-tion, _croniad_, _llyniad_

Sta-tion-er, _safwerthydd_, _gwerthwr papyr_

Stead-fast-ly, _yn ddianwadal_, _yn ddiysgog_

Stead-fast-ness, _dianwadalwch_

Step-fath-er, _llysdad_

Step-moth-er, _llysfam_

Stiff-neck-ed, _gwargaled_, _gwarsyth_

Stig-ma-tize, _senwi_, _gwrthnodi_

Stim-u-late, _symbylu_; _annog_, _cymhell_

Stim-u-lus, _cymhellai_

Stin-gi-ness, _crintachrwydd_

Stip-u-late, _ammodi_; _cytuno_

Stom-ach-er, _bronfoll_, _dwyfroneg_

Strat-a-gem, _ystrangc_, _ystryw_, _dichell_

Straw-ber-ry, _myfien_, _mefusen_

Stren-u-ous, _bywiog_, _ymdrechgar_

Stub-born-ness, _cyndynrwydd_

Stu-di-ous, _llengar_, _myfyrgar_; _diwyd_

Stum-bling-block, _cyff_, _maen tramgwydd_

Stu-pen-dous, _aruthrol_, _rhyfeddol_

Stu-pi-fy, _hurtio_, _syfrdanu_

Stut-ter-ing, _attalddywediad_

Sub-al-tern, _is swyddog_; _is_, _tan_

Sub-di-vide, _adranu_, _dyranu_

Sub-jec-tion, _gwarogaeth_; _ymostyngiad_

Sub-ju-gate, _gwarogi_, _darostwng_

Sub-mis-sion, _ymostyngiad_

Sub-mis-sive, _gostyngedig_, _isel_

Sub-poe-na, _gwyslythr_: _dyfnrwymo_

Sub-scrib-er, _tanysgrifydd_, _cynnorthwywr_

Sub-scrip-tion, _tanysgrifiad_

Sub-se-quent, _canlynol_, _gwedi_, _dilynol_

Sub-si-dy, _arian cymhorth_; _porth-dâl_

Sub-sist-ence, _cynnaliaeth_, _bywioliaeth_; _para_, _arosiad_

Sub-stan-tial, _sylweddol_; _defnyddiol_

Sub-stan-tive, _sylweddair_; _sylweddol_

Sub-sti-tute, _dirprwywr_

Sub-ter-fuge, _gochelfa_; _cyfrwys ocheliad_

Sub-trac-tion, _tyniad allan_, _erthyniaeth_

Sub-til-ty, _minder_, _cyfrwys_

Suc-cess-ful, _llwyddianus_

Suc-ces-sion, _olyniad_, _dilyniad_

Suc-ces-sive, _olynol_, _dilynedigol_

Suc-ces-sor, _olynol_, _dilynydd_

Sud-den-ness, _disymwythdra_

Suf-fer-ance, _goddefiad_; _amynedd_

Suf-fer-er, _dyoddefydd_, _goddefwr_

Suf-fer-ing, _goddefiad_, _dyoddefiant_

Suf-fi-cient, _digon_, _digonol_

Suf-fo-cate, _mygu_, _tagu_

Sug-ges-tion, _crybwylliad_, _amnaid_

Suit-a-ble, _cyfaddas_, _cydweddol_, _addas_

Sul-phur-ous, _brwmstanaidd_

Sum-ma-ry, _crynodeb_; _byr_, _cryno_

Sump-tu-ous, _mawrwych_; _costfawr_

Su-per-fice, _wyneb_, _arwyneb_

Su-per-fine, _meinwych_; _goreu_

Su-per-sede, _diswyddo_: _troi heibio_

Su-per-vise, _gorucholygu_

Sup-ple-ment, _adchwanegiad_

Sup-pli-cate, _erfyn_, _gweddio_, _achrefu_

Sup-port-er, _cynnaliwr_; _attegydd_

Sup-pres-sion, _diddymiad_, _llethiad_

Sup-pres-sive, _celiadol_, _llethiadol_

Sur-cin-gle, _argengl_, _uchgengl_

Sur-feit-ing, _alariad_, _glythineb_; _tra ffiaidd_

Sur-ger-y, _llawfeddygaeth_

Sur-pris-ing, _rhyfeddol_, _aruthrawl_

Sur-ren-der, _rhoddiad i fynu_; _traddodi_, _ymroddi_

Sur-ro-gate, _rhaglaw esgob_

Sur-round-ing, _amgylchynol_, _cylchynol_

Sur-vey-or, _arolygydd_; _mesurydd_

Sur-viv-or, _gorfucheddwr_

Sus-pect-ing, _drwgdybus_, _amheus_

Sus-pen-sion, _crogiad_; _dodiad heibio_

Sus-pi-cion, _drwgdyb_; _amheuad_

Sus-pi-cious, _drwgdybus_, _amheugar_

Sus-te-nance, _ymborth_, _cynnaliaeth_

Syl-la-ble, _sill_, _sillaf_, _silleb_

Syl-la-bus, _crynnydeb_; _penau_

Sym-me-try, _cymesuredd_; _cyfatebiad_

Sym-pa-thize, _cyd-ddioddef_, _cydymdeimlo_

Sym-pa-thy, _cydoddef_, _cydymdeimlad_

Syn-the-sis, _cydosodiad_

Ta-ble-cloth, _bwrddliain_, _lliain bwrdd_

Tale-bear-er, _clepgi_, _chwedlwr_

Talk-a-tive, _chwedleuog_, _dywedgar_

Tan-gi-ble, _cyfhwrddadwy_, _teimladwy_

Tap-es-try, _teisban_; _crogleni_

Tar-paul-ing, _pyglen_; _llongwr_

Tax-a-tion, _trethiad_, _ardrethiad_

Teach-a-ble, _addysgadwy_, _hyddysg_

Tech-ni-cal, _celfyddydawl_, _celfyddus_

Te-di-ous, _hirfaith_, _dygn_; _poenus_

Tel-e-graph, _pellgraff_

Tel-e-scope, _pellddrych_, _ysbienddrych_

Tem-per-ance, _cymmedroldeb_

Tem-per-ate, _cymmedrol_; _sobr_

Tem-po-ral, _amserol_, _tymhorol_; _bydol_, _lleygol_

Temp-ta-tion, _hudiad_; _profedigaeth_

Te-na-cious, _gludiog_; _gwydn_

Ten-der-ness, _tynerwch_, _meddalwch_

Ten-e-ment, _ardrethdy_, _tyddyn_

Term-in-ate, _terfynu_, _gorphen_

Ter-ri-ble, _dychrynllyd_, _arswydus_, _ofnadwy_, _erchyll_

Ter-rif-ic, _dychrynllyd_, _arswydus_

Ter-ri-fy, _brawychu_, _dychrynu_

Tes-ta-ceous, _cregynog_, _cregynaidd_

Test-a-ment, _cymynaeth_, _ewyllys ddiweddaf_

Tes-ta-tor, _cymynai_, _cymynwr_

Tes-ta-trix, _cymynes_, _cymynwraig_

Tes-ti-fy, _tystiolaethu_: _tystio_; _profi_

Thank-ful-ness, _diolchgarwch_

Thanks-giv-ing, _diolchdaliad_

The-a-tre, _chwareudy_; _cemmaes_

Thence-for-ward, _ym mlaen o'r amser hwnw_

The-or-em, _rheol brofadwy_, _gwiredigaeth_

The-o-ry, _golygddysg_, _golygiaeth_

There-a-bout, _o ddeutu yno_, _yn agos_

There-af-ter, _gwedi hyny_, _ar ol hyny_

Thiev-ish-ness, _lladradgarwch_

Thor-ough-fare, _trwyddedfa_

Thought-ful-ness, _meddylgarwch_

Thrash-ing-floor, _llawr dyrnu_

Threat-en-ing, _bygythiad_, _bygyliad_

Thun-der-bolt, _taranfollt_, _mellten_

Thun-der-ing, _taranllyd_; _bygythiol_

Tim-or-ous, _ofnus_, _aneon_

Ti-tle-page, _dalen enwol_, _gwyneb ddalen_

To-geth-er, _ynghyd_, _ar unwaith_

Tol-er-ate, _goddef_, _caniatau_, _gadu_

Tor-ment-or, _poenydiwr_, _poenwr_

Tor-na-do, _corwynt_, _trowynt_

Tor-tu-ous, _torchog_, _dolenog_; _niweidiol_

To-tal-ly, _yn gwbl_, _yn llwyr_

Tour-na-ment, _ffugymgyrch_, _ffugymladd_

Tract-a-ble, _hydrin_, _trinadwy_

Tra-di-tion, _traddodiad_, _hengof_

Trag-e-dy, _dïenchware_; _erchylldro_

Trans-ac-tion, _gorchwyl_, _neges_

Trans-fig-ure, _gweddnewid_

Trans-gres-sion, _troseddiad_, _camwedd_, _anwiredd_

Trans-gres-sor, _troseddwr_

Tran-si-tion, _trofiad_, _trawssymmudiad_

Tran-si-tive, _trofus_, _trawsfynedigol_

Trans-la-tion, _cyfieithiad_, _trosiad_

Trans-la-tor, _cyfieithydd_

Trans-mis-sion, _trosglwyddiad_

Trans-mit-tal, _trosglwydd_

Trans-pa-rent, _tryloyw_, _gloyw_

Trans-verse-ly, _ar groes_, _yn groes ymgroes_

Trav-el-ler, _teithiwr_, _ymdeithydd_

Treach-er-ous, _bradus_, _bradwrus_

Treach-er-y, _brad_, _bradwriaeth_; _twyll_

Treas-u-rer, _trysorydd_, _trysorwr_

Tre-men-dous, _dychrynllyd_, _ofnadwy_

Tri-an-gle, _triongl_, _tryfal_

Tri-bu-nal, _brawdle_, _gorsedd barn_

Trin-i-ty, _trindawd_, _trindod_

Triv-i-al, _gwael_, _dibwys_, _bychanig_

Tri-um-phant, _gorfoleddus_

Trop-i-cal, _trofanawl_

Trou-ble-some, _blin_, _blinderus_, _terfysyus_

Trum-pet-er, _udganwr_, _udgenydd_

Tu-bu-lar, _chwibolog_, _pibgeuol_

Tu-i-tion, _amddiffyniad_, _addysgaeth_

Tur-bu-lence, _annhrefn_, _cyffro_, _terfysg_

Tur-bu-lent, _terfysglyd_, _tonawg_

Typ-i-cal, _cysgodawl_, _arwyddol_

Tyr-an-nize, _gorthrymu_, _gormesu_

Tyr-an-ny, _gormeslywodraeth_, _gormes_

Ul-cer-ate, _llynori_, _gwelïo_

Ul-cer-ous, _llynorog_, _gwelïawg_

Ul-ti-mate, _diweddaf_; _eithaf_

Un-a-ble, _analluog_, _egwan_

Un-a-ware, _yn ddiarwybod_, _yn ddisymwth_

Un-be-lief, _anghred_, _anghrediniaeth_

Un-cer-tain, _ansicr_, _annilys_

Un-civ-il, _anfoesgar_, _anfwyn_

Un-clean-ness, _aflendid_, _brynti_

Un-com-mon, _anghyffredin_, _anaml_

Un-con-cern, _diofalwch_, _diystyrwch_

Un-cov-er, _datdoi_, _dynoethi_, _didoi_

Un-daunt-ed, _diofn_, _eofn_, _hyf_

Un-de-filed, _dihalog_; _dilwgr_

Un-der-hand, _dirgel_, _lladradaidd_

Un-der-line, _tanlinellu_, _islinellu_

Un-der-mine, _tangloddio_; _disodli_

Un-der-neath, _dan_, _tan_, _tanodd_

Un-der-stand, _deall_, _dirnad_, _amgyffred_

Un-der-stood, _dealledig_

Un-der-take, _ymgymeryd_, _ymosod ar_

Un-doubt-ed, _diamheuol_, _dios_

Un-du-late, _tonogi_

Un-ea-sy, _anesmwyth_, _cyffrous_

Un-e-qual, _anghyfartal_, _anwastad_

Un-e-ven, _anwastad_, _anghyfartal_

Un-ex-pert, _anfedrus_, _anhwylus_

Un-fad-ing, _anniflanol_, _anwywol_

Un-faith-ful, _anffyddlon_, _twyllodrus_

Un-feel-ing, _annheimladol_, _dideimlad_

Un-for-seen, _heb ei ragweled_

Un-friend-ly, _anghyfeillgar_

Un-fruit-ful, _anffrwythlawn_, _diffrwyth_

Un-god-ly, _annuwiol_, _didduw_

Un-grace-ful, _anheledliw_, _anhardd_

Un-grate-ful, _anniolchgar_, _diddiolch_

Un-ground-ed, _disail_, _disylfaen_

Un-hap-py, _annedwydd_, _anwynfydedig_

Un-health-y, _afiach_

Un-ho-ly, _ansantaidd_, _aflan_

U-ni-form, _unffurf_, _unwedd_, _unddull_

U-ni-ty, _cyfundeb_, _undeb_, _under_

U-ni-verse, _byd_, _bydysawd_

Un-kind-ness, _anfwynder_, _anrhadlonedd_

Un-law-ful, _anghyfreithlawn_

Un-like-ly, _annhebygol_, _annhebyg_

Un-luck-y, _anffodus_, _anhapus_

Un-mind-ful, _anystyriol_, _difeddwl_, _diofal_

Un-pleas-ant, _anhyfryd_, _annhirion_

Un-read-y, _anmharod_; _anhwylus_

Un-right-eous, _anghyfiawn_, _anuniawn_

Un-ru-ly, _afreolus_, _penwyllt_, _dirëol_

Un-set-tle, _ansefydlu_

Un-sta-ble, _anwadal_

Un-stead-fast, _anniysgog_, _anniymod_

Un-stead-y, _gwamal_, _anwadal_

Un-thank-ful, _diddiolch_, _anniolchgar_

Un-ti-dy, _digryno_, _annhaclus_

Un-time-ly, _annhymig_, _anamserol_

Un-whole-some, _afiachus_, _aniach_

Un-wil-ling, _anewyllysgar_, _anfoddog_

Un-wor-thy, _annheilwng_, _anwiw_

Up-per-most, _uchaf_, _uchelaf_

Up-right-ness, _uniondeb_, _gonestrwydd_

Ur-gen-cy, _anghenrhaid_, _dirni_

Use-ful-ness, _defnyddioldeb_

U-su-al, _arferol_, _cyffredin_

U-surp-er, _traisfeddianwr_, _gormeswr_

Us-u-ry, _ocr_, _arlog_

U-ten-sil, _dodrefnyn_, _llestryn_

Ut-ter-ance, _llafarawd_, _llafariad_, _ymadrodd_; _eithaf_

Ut-ter-ing, _traethiad_; _lled-daeniad_

Ut-ter-ly, _yn hollol_, _yn llwyr_, _yn gwbl_

Ut-ter-most, _eithaf_, _pellaf_, _eithafig_

Va-ca-tion, _dyspaid_, _hamdden_, _seibiant_, _gwaghâd_

Vac-u-um, _gwag_, _gwagder_

Vag-a-bond, _crwydraidd_, _bedlemaidd_

Va-gran-cy, _crwydreiaeth_, _gwibrodiad_

Vain-glo-ry, _gwagogoniant_

Van-i-ty, _gwagedd_, _gwegi_, _oferedd_

Va-por-ous, _mygdarthog_, _agerol_

Va-ri-ance, _amrywiad_; _amrafael_, _anghytundeb_

Va-ri-ous, _amrywiol_; _aml_

Va-ry-ing, _neilliad_, _gwahaniaethiad_

Vas-sal-age, _gwarogaeth_, _caethwasanaeth_

Veg-e-tate, _hydyfu_, _tyfu_

Ve-he-mence, _angerdd_, _taerni_

Ve-he-ment, _angerddol_, _tanbaid_; _awchus_, _llym_

Ve-hi-cle, _cludai_, _cludiedydd_, _clud_

Ven-om-ous, _gwenwynig_, _gwenwynllyd_

Ven-i-son, _hyddgig_, _cig danas_

Ven-ti-late, _gwyntyllio_

Ven-ture-some, _anturiol_

Ver-bal-ly, _mewm geiriau_, _ar air_

Ver-bat-im, _gair yn ngair_, _yn llythyrenol_

Ver-ber-ate, _curo_, _taro_, _ceryddu_

Ver-i-fy, _gwirio_, _gorchwirio_

Ver-i-ly, _yn wir_, _yn ddiau_

Ver-si-fy, _mydru_, _prydyddu_

Vert-i-cal, _nenawl_, _uchbenol_

Vet-er-an, _hen filwr_, _caledfilwr_; _hen_, _oedranus_, _profedig_

Vex-a-tion, _gofid_, _blinder_, _curiad_

Vi-bra-tion, _ymsiglad_, _ysgydwad_

Vic-ar-age, _uchberigloriaeth_

Vice-ge-rent, _rhaglaw_, _huail_

Vic-to-ry, _buddugoliaeth_, _goruchafiaeth_

Vig-i-lance, _gwyliadwriaeth_, _gofal_; _pryder_

Vig-i-lant, _gwyliadwrus_, _gofalus_

Vig-or-ous, _egniol_, _bywiog_

Vil-lain-ous, _ysgeler_, _atgas_, _drygus_

Vin-ci-ble, _gorchfygadwy_, _gorfodadwy_

Vin-di-cate, _diffyn_; _cyfiawnhau_

Vin-e-gar, _gwinegr_, _surlyn_