Irregular nouns

This article is additional to the main page dedicated to Singular and plural nouns.

Here is a list of irregular nouns that needs to be simply memorized. We devided all irregular nouns into three tables according to levels of English language.

Elementary level

Singular Plural
child children
foot feet
goose geese
half halves
life lives
loaf loaves
man men
mouse mice
person people
scarf scarves
shelf shelves
thief thieves
tooth teeth
wife wives
wolf wolves
woman women

Intermediate level

Singular
Plural
appendix
appendices
axis
axes
bacterium
bacteria
basis
bases
cactus
cacti or cactus or cactuses
calf
calves
crisis
crises
criterion
criteria
datum
data
diagnosis
diagnoses
focus
foci or focuses
formula
formulae or formulas
hoof
hooves
hypothesis
hypotheses
index
indices or indexes
medium
media or mediums
matrix
matrices
memorandum
memorandums or memoranda
millennium
millennia
oasis
oases
octopus
octopi
ox
ox or oxen
phenomenon
phenomena
quiz
quizzes
radius
radii
stimulus
stimuli
thesis
theses

Advanced level

Singular
Plural
alumna
alumnae
alumnus
alumni
antithesis
antitheses
apex
apices or apexes
appendix
appendices or appendixes
bacillus
bacilli
bureau
bureaux or bureaus
codex
codices
corpus
corpora
criterion
criteria or criterions
curriculum
curricula or curriculums
die
dice or dies
dwarf
dwarves or dwarfs
ellipsis
ellipses
erratum
errata
genus
genera or genuses
nucleus
nuclei or nucleuses
parenthesis
parentheses
referendum
referenda or referendums
vita
vitae

 

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Choose a correct plural form of nouns

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A mouse
mices
mouses
mouse
mice
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