100 Irregular Plural Nouns in English

The vast majority of English nouns make their plural by adding either -s (books, bands, bells) or -es (boxes, bunches, batches). These plural forms follow a regular pattern.

100 Irregular Plural Nouns List

addendum addenda or addendums
aircraft aircraft
alumna alumnae
alumnus alumni
analysis analyses
antenna antennae or antennas
antithesis antitheses
apex apices or apexes
appendix appendices or appendixes
axis axes
bacillus bacilli
bacterium bacteria
basis bases
beau beaux or beaus
bison bison
bureau bureaux or bureaus
cactus cacti or cactus or cactuses
château châteaux or châteaus
child children
codex codices
concerto concerti or concertos
corpus corpora
crisis crises
criterion criteria or criterions
curriculum curricula or curriculums
datum data
deer deer or deers
diagnosis diagnoses
die dice or dies
dwarf dwarves or dwarfs
ellipsis ellipses
erratum errata
faux pas faux pas
fez fezzes or fezes
fish fish or fishes
focus foci or focuses
foot feet or foot
formula formulae or formulas
fungus fungi or funguses
genus genera or genuses
goose geese
graffito graffiti
grouse grouse or grouses
half halves
hoof hooves or hoofs
hypothesis hypotheses
index indices or indexes
larva larvae or larvas
libretto libretti or librettos
loaf loaves
locus loci
louse lice
man men
matrix matrices or matrixes
medium media or mediums
memorandum memoranda or memorandums
minutia minutiae
moose moose
mouse mice
nebula nebulae or nebulas
nucleus nuclei or nucleuses
oasis oases
offspring offspring or offsprings
opus opera or opuses
ovum ova
ox oxen or ox
parenthesis parentheses
phenomenon phenomena or phenomenons
phylum phyla
quiz quizzes
radius radii or radiuses
referendum referenda or referendums
salmon salmon or salmons
scarf scarves or scarfs
self selves
series series
sheep sheep
shrimp shrimp or shrimps
species species
stimulus stimuli
stratum strata
swine swine
syllabus syllabi or syllabuses
symposium symposia or symposiums
synopsis synopses
tableau tableaux or tableaus
thesis theses
thief thieves
tooth teeth
trout trout or trouts
tuna tuna or tunas
vertebra vertebrae or vertebras
vertex vertices or vertexes
vita vitae
vortex vortices or vortexes
wharf wharves or wharfs
wife wives
wolf wolves
woman Women


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