Anatomy Anatomeg
Anthropology Anthropoleg
Archipelago Ynysfor
Arctic Yr Arctig
Atmosphere Atmosffer
Atom Atom
Bible Beibl
Butter Menyn
Cannabis Cannabis
Christ Crist
Climate Hinsawdd
Democracy Democratiaeth
Demography Demograffeg
Dialect Tafodiaith
Diameter Diamedr
Diamond Diemwnt
Dinosaur Deinosor
Dolphin Dolffin
Dragon Draig
Echinoderm Echinoderm
Ecology Ecoleg
Economics Economeg
Eczema Croenlid
Electron Electron
Encephalitis Enseffalitis
Encyclopedia Gwyddoniadur
Energy Egni (gwyddonol)
Epigram Epigram
Epistemology Epistemoleg
Epitaph Beddargraff
Ethics Moeseg
Ethnic Group Grŵp Ethnig
Etymology Geirdarddiad
Genetics Geneteg
Geomorphology Morffoleg (daearyddiaeth)
Gnosis Gnosis
Grammar Gramadeg
Hero Arwr
Hippopotamus Afonfarch
Hormone Hormon
Hymn Emyn
Lion Llew
Logos Logos
Marble Marmor
Martyr Merthyr
Mathematics Mathemateg
Mesolithic Oes Ganol Y Cerrig
Metaphor Trosiad
Meteorology Meteoroleg
Monarchy Brenhiniaeth
Monk Mynach
Monotheism Undduwiaeth
Morpheme Morffem
Morphology (linguistics) Morffoleg (iaith)
Museum Amgueddfa
Music Cerddoriaeth
Mythology Mytholeg
Oligarchy Oligarchiaeth
Optics Opteg
Orgasm Orgasm
Paleolithic Hen Oes Y Cerrig
Pasta Pasta
Philadelphia Philadelphia
Philology Ieitheg
Phonology Ffonoleg
Photography Ffotograffiaeth
Piracy Môr-ladrad
Plasma (physics) Plasma (ffiseg)
Plastic Plastig
Poetry Barddoniaeth
Prostate Prostrad
Proton Proton
Psychology Seicoleg
Pyramid Pyramid
School Ysgol (addysg)
Synonym Cyfystyr
| Syntax Cystrawen
Theology Diwinyddiaeth
Thermodynamics Thermodynameg
Zoology Sŵoleg
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