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-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-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-qui-site, _rhagorol_, _godidog_; _dewisedig_; _manwl_, _perffaith_
Ex-ten-sion, _ystyniad_; _eangiad_, _helaethiad_
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_
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-cy, _twyll_, _lledrith_, _hudoliaeth_
Fal-si-fy, _ffugio_; _celwyddo_; _gwyrdroi_
Fam-i-ly, _teulu_, _tylwyth_; _gwaedoliaeth_
Fa-mil-iar, _cyfaill_, _cydnabod_; _teuluaidd_; _cyfeillgar_; _cynnefin_
Fath-om-less, _diwaelod_; _anamgyffred_; _dwfn_
Fa-vour-ite, _hoffddyn_, _anwylyd_, _hoffyn_
Fel-low-ship, _cymdeithas_: _cymdeithasu_
Fem-in-ine, _benywol_, _menywaidd_; _tyner_