100 Irregular Plural Nouns List and Definition! When you are learning a new language, one of the first things you need to learn is how to form plurals. There are many rules that govern plural formation in English, but there are also a number of irregular nouns that don’t follow the normal patterns. This list includes 100 of the most common irregular nouns, their plural forms, and definitions. Knowing these words will help you form plurals correctly and accurately use these nouns in your writing.
English nouns are inflected for grammatical numbers, meaning that if they are of the countable type, they generally have different forms for singular and plural. This article discusses the plural forms of irregular nouns.
Table of Contents
100 Irregular Plural Nouns List
10 Popular Plural Nouns
1- Mice: plural form of mouse
2- Cacti: plural form of cactus
3- Geese: plural form of goose
4- Children: plural form of child
5- Teeth: plural form of tooth
6- Feet: plural form of foot
7- Men: plural form of man
8- Women: plural form of woman
9- Ponies: plural form of pony
10- Fish: plural form of fish
List of Irregular Plural Nouns
| Nouns | Plural Forms |
| antenna | antennae/antennas |
| formula | formulae/formulas |
| quiz | quizzes |
| curriculum | curricula/curriculums |
| minutia | minutiae |
| tooth | teeth |
| château | châteaux/châteaus |
| loaf | loaves |
| swine | swine |
| beau | beaux/beaus |
| hypothesis | hypotheses |
| shrimp | shrimp/shrimps |
| dwarf | dwarves/dwarfs |
| oasis | oases |
| vita | vitae |
| apex | apices/apexes |
| genus | genera/genuses |
| referendum | referenda/referendums |
| codex | codices |
| louse | lice |
| symposium | symposia/symposiums |
| aircraft | aircraft |
| fez | fezzes/fezes |
| ox | oxen/ox |
| wolf | wolves |
| corpus | corpora |
| matrix | matrices/matrixes |
| tableau | tableaux/tableaus |
| bacillus | bacilli |
| grouse | grouse/grouses |
| self | selves |
| erratum | errata |
| opus | opera/opuses |
| wharf | wharves/wharfs |
| concerto | concerti/concertos |
| man | men |
| synopsis | synopses |
| die | dice/dies |
| nucleus | nuclei/nucleuses |
| vertex | vertices/vertexes |
| ellipsis | ellipses |
| offspring | offspring/offsprings |
| vortex | vortices/vortexes |
| appendix | appendices/appendixes |
| goose | geese |
| salmon | salmon/salmons |
| bison | bison |
| index | indices/indexes |
| species | species |
| bacterium | bacteria |
| half | halves |
| series | series |
| criterion | criteria/criterions |
| memorandum | memoranda/memorandums |
| thief | thieves |
| alumnus | alumni |
| focus | foci/focuses |
| phenomenon | phenomena/phenomenons |
| basis | bases |
| hoof | hooves/hoofs |
| sheep | sheep |
| crisis | crises |
| medium | media/mediums |
| thesis | theses |
| deer | deer/deers |
| mouse | mice |
| tuna | tuna/tunas |
| antithesis | antitheses |
| fungus | fungi/funguses |
| radius | radii/radiuses |
| axis | axes |
| graffito | graffiti |
| scarf | scarves/scarfs |
| bureau | bureaux/bureaus |
| larva | larvae/larvas |
| stimulus | stimuli |
| addendum | addenda/addendums |
| faux pas | faux pas |
| ovum | ova |
| wife | wives |
| analysis | analyses |
| foot | feet/foot |
| phylum | phyla |
| cactus | cacti/cactus/cactuses |
| libretto | libretti/librettos |
| stratum | strata |
| diagnosis | diagnoses |
| nebula | nebulae/nebulas |
| vertebra | vertebrae/vertebras |
| datum | data |
| moose | moose |
| trout | trout/trouts |
| alumna | alumnae |
| fish | fish/fishes |
| parenthesis | parentheses |
| woman | women |
| child | children |
| locus | loci |
| syllabus | syllabi/syllabuses |
Irregular Plural Nouns – Infographics
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