For an introduction to the grammatical gender of Welsh nouns see this blog’s companion piece Enwau Gwryaidd/Masculine Nouns

KEY
●Most plurals are formed by adding the suffix shown after a dash
●Plurals formed otherwise are shown in brackets
●Some nouns have no plural or they are plurals already or the singular and plural are the same
† = Can also be masculine

Accent – Acen–ion
Accident – Damwain (Damweiniau)
Acre – Erw–au
Advantage – Mantais (Manteision)
Adverb – Adferf–au
Advertisement – Hysbyseb–ion
Aeroplane – Awyren–nau
Agriculture – Amaethyddiaeth
Alphabet – Wyddor
Ambition – †Uchelgais (Uchelgeisiau)
Ancestry/Kinship – Ach–au
Angle – Ongl–au
Ankle – Ffêr (Fferau)
Appearance – †Golwg (Golygon)
Apron – Ffedog–au
Architecture – Pensaernïaeth
Argument – Dadl–euon
Arm – Braich (Breichiau)
Army – Byddin–oedd
Arrow – Saeth–au
Arsehole – †Twll Tin
Art/Craft – Celf–au
Article – Erthygl–auc
Ash [tree] – Onnen (Ynn)
Association/Society – Cymdeithas–au
Astronomy – Seryddiaeth
Audience – Cynulleidfa–oedd
Aunt – Modryb–edd
Author – Awdures–au
Axle – Echel–au
Bag/Pouch – Cod–au
Ball – Pêl (Peli)
Basket – Basged–i
Bathroom – Ystafell–oedd ymolchi
Battle/Fight – Brwydr–au
Beak – Pig–au
Bean – Ffeuen (Ffa)
Beard – Barf–au
Bedroom – Ystafell wely (Ystafelloedd gwely)
Bee – Gwenynen (Gwenyn)
Bell – Cloch (Clychau)
Bereavement – Profedigaeth–au
Biology – Bioleg
Birth – Genedigaeth–au
Biscuit – Bisged–i
Blackberry – Mwyaren Ddu (Mwyar Duon)
Blackbird – Mwyalchen (Mwyalchod)
Blanket – Planced–i
Border/Boundary – Ffin–iau
Botany – Botaneg
Bottle – Potel–i
Bowl – Powlen–ni
Branch – Cangen (Canghennau)
Breast – Bron–nau
Breath –†Anadl
Bride – Priodferch–ed
Bridge – Pont–ydd
Brook – Nant (Nentydd)
Bush – Perth–i
Butterfly – Pili-pala–s/Iâr fach yr haf (Ieir bach yr haf)
Cabbage – Bresychen (Bresych)
Cake – Teisen–ni
Call – Galwad–au
Capital [city] – Prifddinas–oedd
Career – Gyrfa–oedd
Carrot – Moronen (Moron)
Cat – Cath–od
Cauliflower – Blodfresychen (Blodfresych)
Cave – Ogof–âu
Cellar – Seler–i
Centre – Canolfan–nau
Century – Canrif–oedd
Chair – Cadair (Cadeiriau)
Championship – Pencampwriaeth–au
Channel – Sianel–i
Chapter – Pennod (Penodau)
Characteristic – Nodwedd–ion
Charity – Elusen–nau
Cheek – Boch–au
Chemistry – Cemeg
Cherry – Ceiriosen (Ceirios)
Chimney – Simnai (Simneiau)
Chin/Jaw – Gên (Genau)
Church – Eglwys–i
Chute – Llithren
Cigarette – Sigarét (Sigarennau)
Cinema – Sinema (Sinemâu)
City – Dinas–oedd
Cloak – Mantell (Mentyll)
Coat – Côt (Cotiau)
Collar – †Coler–i
Colliery – Glofa (Glofeydd)
Column/Pillar – Colofn–au
Comb – †Crib–au
Commerce – Masnach
Comparison – Cymhariaeth (Cymariaethau)
Competition -Cystadleuaeth (Cystadlaethau)
Concert –†Cyngerdd (Cyngherddau)
Congregation – Cynulleidfa–oedd
Contest – Gornest–au
Conversation/Chat – Sgwrs (Sgyrsiau)
Copyright – Hawlfraint (Hawlfreintiau)
Costume – Gwisg–oedd
Country – Gwlad (Gwledydd)
County – Sir–oedd
Cow – Buwch (Buchod)
Crime – Trosedd–au
Cross – Croes–au
Crossroad – Croesffordd (Croesffyrdd)
Crow – Brân (Brain)
Crowd – Tyrfa–oedd
Crown – Coron–au
Cuckoo – Cog–au
Cuddle – †Cwtch
Curse – Rheg–feydd
Curtain – Llen–ni
Cushion/Pillow – Clustog–au
Dale/Meadow – Dôl (Dolydd)
Dance – Dawns–feydd
Dawn – Gwawr
Death – Marwolaeth–au
Debate – Dadl–euon
Debt – Dyled–ion
Department – Adran–nau
Desk – Desg–iau
Dialect – Tafodiaith (Tafodieithoedd)
Diocese – Esgobaeth–au
Disaster/Calamity –†Trychineb–au
Discipline – Disgyblaeth–au
Discussion – Trafodaeth–au
Dish – Dysgl–au
District/Area – Ardal–oedd
Ditch – Ffos–ydd
Document – Dogfen–nau
Doubt – Amheuaeth (Amheuon)
Dragon – Draig (Dreigiau)
Drama/Play – Drama (Dramâu)
Dream – †Breuddwyd–ion
Dress – Ffrog–iau
Dresser – Dresel–i
Drill – †Dril–iau
Drink – Diod–ydd
Duck – Hwyaden (Hwyaid)
Duty/Obligation – Dyletswydd–au
Ear – Clust–iau
Earth – Daear–oedd
Economics – Economeg
Economy – Economi (Economïau)
Edge – Ymyl–on
Education – Addysg
Effect – Effaith (Effeithiau)
Effort – Ymdrech–ion
Elbow – †Penelin–oedd
Element/Particle – Elfen–nau
Endeavour – Ymgais (Ymgeision)
Entrance – Mynedfa (Mynedfeydd)
Envelope – Amlen–ni
Environment – Amgylchedd
Estate – Stad–au
Estuary – Aber–oedd
Evening – Noswaith (Nosweithiau)
Example – Enghraifft (Enghreifftiau)
Exhibition – Arddangosfa (Arddangosfeydd)
Exit – Allanfa (Allanfeydd)
Fable/Tale – Chwedl–au
Fact – Ffaith (Ffeithiau)
Factory – Ffatri (Ffatrïoedd)
Farm – Ffarm (Ffermydd)
Fashion – †Ffasiwn (Ffasiynau)
Fate – Ffawd (Ffodion)
Favour – Cymwynas–au
Feast – Gwled–oedd
Feat – Camp–au
Fern – Rhedynen (Rhedyn)
Festival/Holiday – Gŵyl (Gwyliau)
Fever – Twymyn–au
Film – Ffilm–iau
Fine – Dirwy–on
Fireplace – †Grât (Gratiau)
Flag – Baner–i
Fly – Cleren (Clêr)
Folk/Ordinary People – Gwerin–oedd
Foot [measurement] – Troedfedd–i
Ford – Rhyd–au
Forest – Fforest–ydd
Fork – Fforc (Ffyrc)
Form [paper] – Ffurflen–ni
Fort – Caer–au
Fortnight – †Pythefnos–au
Freezer – Rhewgell–oedd
Fridge – Oergell–oedd
Fun/Mood – Hwyl
Furnace – Ffwrnais (Ffwrneisiau)
Fuss – Ffwdan
Gallery – Oriel–au
Game – Gêm (Gemau)
Garden – Gardd (Gerddi)
Garment – Gwisg–oedd
Gate – Clwyd–i
Gate – Gât (Gatiau)
Gem – †Gem–au
Geography – Daearyddiaeth
Geology – Daeareg
Gift – Rhodd–ion
Girl/Daughter – Merch–ed
Girl – Geneth–od
Girl – Croten (Crotesi)
Glove – Maneg (Menyg)
Goal – Gôl (Goliau)
Goat – Gafr (Geifr)
Goddess – Duwies–au
Goose – Gŵydd (Gwyddau)
Government – Llywodraeth–au
Grade/Degree – Gradd–au
Granddaughter – Wyres–au
Grandmother – Mamgu (Mamau-cu)
Grandmother – Nain (Neiniau)
Graveyard – Mynwent–ydd
Guitar – Gitâr (Gitarau)
Gull – Gwylan–od
Gym – Campfa
Hall – Neuadd–au
Hand – Llaw (Dwylo)
Handkerchief – Hances–i
Handle – Dolen–ni
Harp – Telyn–au
Hat – Het–iau
Hazel [tree] – Collen (Cyll)
Headmistress – Prifathrawes–au
Heart – Calon–nau
Hearth – Aelwyd–ydd
Heaven – Nef–oedd
Heel – †Sawdl (Sodlau)
Helmet – Helmed–au
Hen – Iâr (Ieir)
Hill – Rhiw–iau
Holly – Celynnen (Celyn)
Hour – Awr (Oriau)
Hymn – †Emyn–au
Idiom – Idiom–au
Inch – Modfedd–i
Inspiration – Ysbrydoliaeth
Interval – Egwyl–iau
Island – Ynys–oedd
Item – Eitem–au
Jacket – Siaced–i
Job – Swydd–i
Journalism – Newyddiaduraeth
Journey – Taith (Teithiau)
Jump/Leap – Naid (Neidiau)
Jumper – Siwmper–i
Junction [railway] – Cyffordd (Cyffyrdd)
Key – Allwedd–i
Kingdom – Teyrnas–oedd
Kiss – †Cusan–au
Kitchen – Cegin–au
Knee – Pen-lin–au
Knife – Cyllell (Cyllyll)
Knowledge – Gwybodaeth
Ladder – Ysgol–ion
Lane – Lôn (Lonydd)
Language – Iaith (Ieithoedd)
Law – Cyfraith (Cyfreithiau)
Law/Statute – Deddf–au
Lawn – Lawnt–iau
Leaf – Deilen (Dail)
Leaflet – Taflen–ni
League – Cynghrair (Cynghreiriau)
Leek – Cenhinen (Cennin)
Leg – Coes–au
Leisure – Hamdden
Lesson – Gwers–i
Lettuce – Letysen (Letys)
Library – Llyfrgell–oedd
Licence – Trwydded–au
Lift – Lifft–iau
Lightning – Mellten (Mellt)
Line – Llinell–au
Lip – Gwefus–au
List – Rhestr–au
Literature – Llenyddiaeth–au
Livelihood – Bywoliaeth–au
Loaf – Torth–au
Lorry – Lori (Lorïau)
Loss – Colled–ion
Lounge – Lolfa
Luck – Lwc
Lull – Egwyl–iau
Lullaby – Hwiangerdd–i
Magpie – Pioden (Piod)
Maid – Morwyn (Morynion)
Mantlepiece – Silff-ben-tân (Silffoedd-pen-tân)
Mare – Caseg (Cesig)
Market – Marchnad–oedd
Mathematics – Mathemateg
Menu – Bwydlen–ni
Mercy – Trugaredd–au
Message – Neges–euon
Metre – Metr–au
Mile – Milltir–oedd
Mill – Melin–au
Million – Miliwn (Miliynau)
Moon – Lleuad–au
Moor – Rhos–ydd
Moral – Moes–au
Mother – Mam–au
Motorway – Traffordd (Traffyrdd)
Mouse – Llygoden (Llygod)
Mouth – Ceg–au
Murder – Llofruddiaeth–au
Museum – Amgueddfa (Amgueddfeydd)
Mushroom – Madarchen (Madarch)
Music – Cerddoriaeth
Nail [carpentry] – Hoelen (Hoelion)
Nation – Cenedl (Cenhedloedd)
Nature – Natur
Needle – Nodwydd–au
Net – Rhwyd–au
Netball – Pêl-rwyd
News – Newydd–ion
Niece – Nith–oedd
Night – Nos–au
Nostril – Ffroen–au
Novel – Nofel–au
Number/Amount – †Nifer–oedd
Nurse – Nyrs–ys
Nursery – Meithrinfa (Meithrinfeydd)
Nut – Cneuen (Cnau)
Oak – Derwen (Derw)
Occupation – Galwedigaeth–au
Office – Swyddfa (Swyddfeydd)
Operation [surgical] – Llawdriniaeth–au
Opinion – Barn–au
Orchestra – Cerddorfa(Cerddorfeydd)
Order/Rank – Urdd–au
Ounce – Owns–ys
Oven – Ffwrn (Ffyrnau)
Owl – Tylluan–od
Pan – Padell–i
Pancake – Crempog–au
Parish – Llan–nau
Parliament/Senate – Senedd–au
Part/Section/Share – Rhan–nau
Party [political] – Plaid (Pleidiau)
Pasture – Porfa (Porfeydd)
Pea – Pysen (Pys)
Peach – Eirinen wlanog(Eirin gwlanog)
Pear – Gellygen (Gellyg)
Penalty/Punishment – Cosb–au
Penis – Cal–iau
Penny – Ceiniog–au
People – Pobl–oedd
Period – Adeg–au
Pharmacy – Fferyllfa (Fferyllfeydd)
Phone – Ffôn (Ffonau)
Physics – Ffiseg
Pie – Pastai (Pasteiod)
Pigeon – Colomen–nod
Pincers – Gefel (Gefeiliau)
Pipe [smoking] – Pib–au
Pipe [drain] – Pibell–i
Place – †Man–nau
Planet – Planed–au
Platform – †Llwyfan–au
Plum – Eirinen (Eirin)
Pocket – Poced–i
Poem – Cerdd–i
Poetry – Barddoniaeth
Politics – Gwleidyddiaeth
Pony – Merlen (Merlod)
Population – Poblogaeth–au
Potato – Taten (Tatws)
Pound [money] – Punt (Punnau/Punnoedd)
Prayer – Gweddi (Gweddïau)
Prejudice – Rhagfarn–au
Present [gift] – Anrheg–ion
Press [print] – Gwasg (Gweisg)
Princess – Tywysoges–au
Principle – Egwyddor–ion
Prize/Reward – Gwobr–au
Problem – Problem–au
Profession – Galwedigaeth–au
Programme – Rhaglen–ni
Prose – Rhyddiaith
Psychology – Seicoleg
Quarrel – Ffrae–on
Quarry – Chwarel–i
Queen – Brenhines (Breninesau)
Race [competition] – Ras–ys
Race [ethnicity] – Hil
Railway – Rheilffordd (Rheilffyrdd)
Rainbow – Enfys–au
Range [scope] – Ystod–au
Raspberry – Mafonen (Mafon)
Razor – Rasal (Raselydd)
Reception – Derbynfa
Recipe – Rysáit (Rysetiau)
Record – Record–iau
Refinery – Purfa (Purfeydd)
Region – Bro (Bröydd)
Register/Catalogue – Cofrestr–au
Relationship – Perthynas
Religion – Crefydd–au
Rest/Pause – Saib (Seibiau)
Rhyme – Odl–au
Right [entitlement] – Hawl–iau
Ring – Modrwy–au
River – Afon–ydd
Road – Heol–ydd
Rock – Craig (Creigiau)
Romance – Rhamant–au
Room – Ystafell–oedd
Rope – Rhaff–au
Row [line] – Rhes–i
Sack – †Sach-au
Sandwich – Brechdan–au
Satellite – Lloeren–nau
Saucepan – Sosban–nau
Saucer – Soser–i
Saw – Llif–iau
Scales [weighing] – Clorian–nau
Scarf – Sgarff–au
Scenery/View – Golygfa (Golygfeydd)
School – Ysgol–ion
Science – Gwyddoniaeth
Scream/Shriek – Sgrech–iadau
Screen – Sgrîn (Sgriniau)
Screw – Sgriw–iau
Scripture – Ysgrythur–au
Seat – Sedd–au
Secret – Cyfrinach–au
Sentence [writing] – Brawddeg–au
Sentence [court] – Dedfryd–au
Series – Cyfres–i
Sermon – Pregeth–au
Shape/Form – Ffurf–iau
Shed – Sied–au
Sheep – Dafad (Defaid)
Shelf – Silff–oedd
Shell – Cragen (Cregyn)
Shelter – Lloches–au
Ship – Llong–au
Shiver – Ias–au
Shoe – Esgid–iau
Shoelace – Carrai (Careiau)
Shop – Siop–au
Shore/Riverbank – Glan–nau
Shot/Blow – †Ergyd–ion
Shoulder – Ysgwydd–au
Shout – Gwaedd–au
Shovel – Rhaw–iau
Show – Sioe–au
Shower – Cawod–au
Side – Ochr–au
Sigh – Ochenaid (Ocheneidiau)
Signature – Llofnod–ion
Sister – Chwaer (Chwiorydd)
Situation – Sefyllfa–oedd
Skill – Medr–au
Skirt – Sgert–iau
Sky – Awyr
Slate – Llechen (Llechi)
Slice – Tafell–i
Smile – Gwên (Gwenau)
Smithy – Gefail (Gefeiliau)
Snail – Malwen (Malwod)
Snake – Neidr (Nadredd)
Sock/Stocking – Hosan–au
Song – Cân (Caneuon)
Sound – Sain (Seiniau)
Source [water] – Ffynhonnell (Ffynonellau)
Spectacles/Glasses – Sbectol–au
Speech – Araith (Areithiau)
Split – †Hollt–au
Spoon – Llwy–au
Squirrel – Gwiwer–od
Stage – Llwyfan–nau
Stair/Step – Gris–iau
Star – Seren (Sêr)
Station – Gorsaf–oedd
Stick – Ffon (Ffyn)
Stone – Carreg (Cerrig)
Storm – Storm–ydd
Story – Stori (Storïau)
Stove – Stof–au
Strawberry – Mefusen (Mefus)
Street – Stryd–oedd
Strike – Streic–iau
Suit [clothing] – Siwt–iau
Sunshine – Heulwen
Supermarket – Archfarchnad–oedd
Surgery – Meddygfa (Meddygfeydd)
Swallow – Gwennol (Gwenoliaid)
Swede – Rwden (Rwdins)
System/Arrangement/Sequence – Trefn–au
Tail – Cynffon–nau
Talent – Dawn (Doniau)
Tax – Treth–i
Taste [preference] – Chwaeth–au
Teacher [female] – Athrawes–au
Technology – Technoleg–au
Temper/Temperament – Tymer
Tent – Pabell (Pebyll)
Theatre – Theatr–au
Thorn – Draenen (Drain)
Thousand – Mil–oedd
Thread – Edau (Edafedd)
Thunder – Taran-au
Tie – Tei–s
Time [occasion] – Gwaith (Gweithiau)
Timetable – Amserlen–ni
Torch – Ffagl–au
Town – Tref–i
Tragedy – Trasiedi (Trasiedïau)
Treatment – Triniaeth–au
Tree – Coeden (Coed)
Tribute – Teyrnged–au
Tune – Alaw–on
Turnip – Meipen (Maip)
Unit – Uned–au
University – Prifysgol–ion
Vagina – Wain (Weiniau)
Valve – Falf–au
Van – Fan–iau
Vandalism – Fandaliaeth
Variety – Amrywiaeth–au
Verb – Berf–au
Victory – Buddugoliaeth–au
Virgin – Gwyry (Gweryddon)
Vocabulary – Geirfa–oedd
Volume – Cyfrol–au
Vote – Pleidlais (Pleidleisiau)
Wage/Salary – †Cyflog–au
Watch – Oriawr–on
Waterfall – Rhaeadr–au
Wave [sea] – Ton–nau
Way/Road – Ffordd (Ffyrdd)
Wedding – Priodas–au
Week – Wythnos–au
Well/Fountain – Ffynnon (Ffynhonnau)
Welsh [language] – †Cymraeg
Wheel – Olwyn–ion
Whip – Chwip–iau
Widow – Gweddw–on
Wife – Gwraig (Gwragedd)
Wire – Gwifren (Gwifrau)
Window – Ffenestr–i
Witch – Dewin–es
Woman/Female – Benyw–od
Woman – Menyw–od
Womb – Croth–au
Wood – Coedwig–oedd
Wren – †Dryw–od
Yard [measurement] – Llathen–ni
Year – Blwyddyn (Blynyddoedd)
Zone – Cylched–au
Zoo – Sŵ
Zoology – Sŵoleg