Some nouns are exceptions when it comes to making them plural. These nouns are called irregular plurals. When these irregular nouns become plural, their spelling changes in a different way, or it might not change at all. Here are some very tricky irregular nouns.
Singular
| Plural
|
-f /-fe is changed to - ves in the plural
|
Calf
elf
dwarf
half
hoof
knife
leaf
life
loaf
scarf
self
sheaf
shelf
thief
wife
wolf
| calves
elves
dwarves/dwarfs
halves
hooves/hoofs
knives
leaves
lives
loaves
scarves/scarfs
selves
sheaves
shelves
thieves
wives
wolves
|
Nouns ending in -f /-fe have the plural inflexion –s in the regular way
|
belief
brief
proof
chief
safe
cliff
gulf
reef
grief
handkerchief
roof
sheriff
staff
| beliefs
briefs
proofs
chiefs
safes
cliffs
gulfs
reefs
griefs
handkerchiefs
roofs
sheriffs
staffs
+proper nouns
|
Some nouns change the vowel sound in becoming plural
|
man
fireman
woman
foot
goose
tooth
louse
mouse
child
ox
| men
firemen
women
feet
geese
teeth
lice
mice
children
oxen
|
- o becomes - os
|
auto
kangaroo
kilo
memo
photo
piano
pro
solo
soprano
studio
tattoo
video
zoo
| autos
kangaroos
kilos
memos
photos
pianos
pros
solos
sopranos
studios
tattoos
videos
zoos
|
- o becomes - oes
|
echo
embargo
hero
potato
tomato
torpedo
veto
| Echoes
embargoes
heroes
potatoes
tomatoes
torpedoes
vetoes
|
- o becomes either - s or - es:
|
buffalo
cargo
mosquito
motto
tornado
volcano
zero
| buffalos/buffaloes
cargos/cargoes
mosquitos/mosquitoes
mottos/mottoes
tornados/tornadoes
volcanos/volcanoes
zeros/zeroes
|
Some nouns do not change at all
|
bison
deer
fish
offspring
sheep
moose
swine
| bison
deer
fish, fishes
offspring
sheep
moose
swine
|
Nouns ending in - us with plural - i:
|
alumnus
bacillus
focus
fungus
hippopotamus
nucleus
octopus
radius
stegosaurus
stimulus
syllabus
terminus
| alumni
bacilli
foci
fungi/funguses
hippopotami/hippopotamuses
nuclei
octopi/octopuses
radii
stegosauri
stimuli
syllabi/syllabuses
termini
|
Nouns ending in - um with plural - a:
|
Bacterium
Curriculum
datum
erratum
medium
memorandum
symposium
stratum
| Bacteria
curricula /curriculums
data
errata
media
memoranda/memorandums
symposia/symposiums
strata
|
Nouns ending in - ex, - ix becoming plural - ices:
|
appendix
cervix
index
matrix
| appendices/ appendixes
cervices/cervixes
indices/indexes
matrices/matrixes
|
Nouns ending in - is becoming - es in plural:
|
analysis
axis
basis
crisis
diagnosis
emphasis
hypothesis
oasis
parenthesis
synopsis
thesis
| analyses
axes
bases
crises
diagnoses
emphases
hypotheses
oases
parentheses
synopses
theses
|
Nouns ending in - on becoming - a:
|
criterion
phenomenon
automaton
| criteria
phenomena
automata
|