List of Irregular Nouns and Their Plural Forms

child - children

man - men

woman - women

tooth - teeth

foot - feet

goose - geese

person - people/persons

cactus - cacti

index - indices

die - dice

ox - oxen

analysis - analyses

antenna - antennae

appendix - appendices

axis - axes

basis - bases

criterion - criteria

deer - deer

formula - formulae

hypothesis - hypotheses

life - lives

matrix - matrices

medium - media

mouse - mice

octopus - octopi/octopuses

parenthesis - parentheses

vertex - vertices

ovum - ova

larva - larvae

half - halves

thief - thieves

bureau - bureaux

vortex - vortices

genus - genera

bacterium - bacteria

syllabus - syllabi/syllabuses

radius - radii

thesis - theses

crisis - crises

leaf - leaves

datum - data

louse - lice

ellipsis - ellipses

memorandum - memoranda

focus - foci

nucleus - nuclei

curriculum - curricula

phenomenon - phenomena

bacterium - bacteria

elf - elves

shelf - shelves

wife - wives

fungus - fungi

sheep - sheep

stimulus - stimuli

alumnus - alumni

graffito - graffiti

deer - deer

swine - swine

series - series

bacillus - bacilli

knife - knives

wolf - wolves

stratum - strata

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