There are several nouns that have irregular plural forms

The Noun

What is a noun?

A noun is a part of speech that is used to name a person, place, thing, quality, or action. A noun can function as a subject, object, complement, appositive, or object of a preposition.

Plural vs singular

Nouns can be singular or plural. The plural form of a noun is usually formed by adding s at the end of the noun. But this is not always the case. There are exceptions to the rule. Some plurals are irregular:

Singular	Plural
fish	fish
tooth	teeth
man	men
woman	women

Different types of nouns

There are different types of nouns:

1. An abstract noun names an idea, event, quality, or concept (freedom, love, courage...) Concrete nouns name something recognizable through the sense (table, dog, house...)

2. Animate nouns refer to a person, animal, or other creature (man, elephant, chicken...) Aninanimate nounrefers to a material object (stone, wood, table...)

3. A collective noun describes a group of things or people as a unit (family, flock, audience...)

4. Common noun is the name of a group of similar things (table, book, window...) Proper nouns, however, refer to the name of a single person, place or thing (John, Joseph, London...)

5. Compound nouns refer to two or more nouns combined to form a single noun (sister-in-law, schoolboy, fruit juice)

6. Countable (or count) nouns have a singular and a plural form. In plural, these nouns can be used with a number- they can be counted. (friends, chairs, houses, boys...) Uncountable (or non count) nouns, however, can only be used in singular. They can't be counted. (money, bread, water, coffee...)

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Plurals

There are several nouns that have irregular plural forms - student2.ru

English plural nouns

In order to change a singular noun to its plural form in English, you usually add "s". For example, the plural of book is books. The plural of table is tables. These are regular plurals.

But there are many nouns which don't follow this rule. For example the plural of fish is fish. The plural of tooth is teeth. These are irregular plurals

Regular plurals:

Form:

Add "s" to the noun:

Noun

+ S

While many plural nouns follow this rule, the spelling sometimes differ.

Examples:

Singular	Plural
snake	snakes
window	windows
box	boxes
boy	boys
lorry	lorries
potato	potatoes
knife	knives

Spelling of plurals:

The plural form of most nouns is created simply by adding the letter "s".

· more than one snake = snakes

· more than one girl = girls

· more than one window = windows

Nouns that end in -ch, x, s, z or s-like sounds, however, will require an es for the plural:

· more than one witch = witches

· more than one box = boxes

· more than one gas = gases

· more than one bus = buses

· more than one kiss = kisses

Nouns that end in a vowel + y take the letter s:

· more than one boy = boys

· more than one way = ways

Nouns that end in a consonant + y drop the y and take ies:

· more tha one baby = babies

· more than one lorry = lorries

A lot of nouns that end in o take es in the plural:

· more than potato = potatoes

· more than one hero = heroes

o becomes oes
echo	echoes
embargo	embargoes
hero	heroes
potato	potatoes
tomato	tomatoes
torpedo	torpedoes
veto	vetoes

Some nouns ending in o break the above rule and get os in the plural form:

o becomes os
auto	autos
kangaroo	kangaroos
kilo	kilos
memo	memos
photo	photos
piano	pianos
pimento	pimentos
pro	pros
solo	solos
soprano	sopranos
studio	studios
tattoo	tattoos
video	videos
zoo	zoos

Other nouns ending in o get either os or oes i the plural forms:

o becomes os or oes
buffalo	buffalos/buffaloes
cargo	cargos/cargoes
halo	halos/haloes
mosquito	mosquitos/mosquitoes
motto	mottos/mottoes
no	nos/noes
tornado	tornados/tornadoes
volcano	volcanos/volcanoes
zero	zeros/zeroes

Plurals of nouns that end in f or fe usually change the f sound to a v sound and add s or -es.

· more than one knife = knives

· more than one leaf = leaves

· more than one hoof = hooves

· more than one life = lives

· more than one self = selves

· more than one elf = elves

Irregular plurals:

There are several nouns that have irregular plural forms.

Singular	Plural
fish	fish
sheep	sheep
barracks	barracks
foot	feet
tooth	teeth
goose	geese
tooth	teeth
goose	geese
child	children
man	men
woman	women
person	people
mouse	mice

Plurals formed in this way are sometimes called irregular plurals or mutated (or mutating) plurals.

· more than one child = children

· more than one woman = women

· more than one man = men

· more than one person = people

· more than one goose = geese

· more than one mouse = mice

· more than one barracks = barracks

· more than one deer = deer

Other irregular plural forms include the following:

Some foreign nouns retain their plural. (Note that some of them adapted the s of the English plural form!)

Singular	Foreign plural	English plural
alga	algae
amoeba	amoebae	amoebas
antenna	antennae	antennas
formula	formulae	formulas
larva	larvae
nebula	nebulae	nebulas
vertebra	vertebrae

Nouns ending in us get a, i or the s of the English plural:

Singular	Foreign plural	English plural
corpus	corpora
genus	genera
alumnus	alumni
bacillus	bacilli
cactus	cacti	cactuses
focus	foci
fungus	fungi	funguses
nucleus	nuclei
octopus	octopi	octopuses
radius	radii
stimulus	stimuli
syllabus	syllabi	syllabuses
terminus	termini

Nouns ending in um get a, i or the s of the English plural:

Singular	Foreign plural	English plural
addendum	addenda
bacterium	bacteria
curriculum	curricula	curriculums
datum	data
erratum	errata
medium	media
memorandum	memoranda	memorandums
ovum	ova
stratum	strata
symposium	symposia	symposiums

Nouns ending in ex or ix get ices or get the s of the English plural:

Singular	Foreign plural	English plural
apex	apices	apexes
appendix	appendices	appendixes
cervix	cervices	cervixes
index	indices	indexes
matrix	matrices	matrixes
vortex	vortices

Nouns ending in is becoming es in plural:

Singular	Plural form
analysis	analyses
axis	axes
basis	bases
crisis	crises
diagnosis	diagnoses
emphasis	emphases
hypothesis	hypotheses
neurosis	neuroses
oasis	oases
parenthesis	parentheses
synopsis	synopses
thesis	theses