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All Irregular Nouns in the English Language

Irregular Nouns

Whereas most nouns are easily plural with a few simple changes, such as the rule of adding "s" or "es" to the end of a word, or other rules that turn singular to plural.

There is one group of nouns that do not seem to follow the rules called irregular nouns that are not collected in a "normal" way.

But also remember to see all the vocabulary that has the same singular and plural forms, after reading this lesson.


All irregular nouns

 

For example, the plural form of MAN is MEN, not MANS. The plural form of WOMAN is WOMEN, not WOMANS.

There are hundreds of irregular plural nouns, and in fact, you should memorize them through reading and speaking.

However, Here are all irregular nouns:


A

  • Singular: Alga
  • Plural: Algae
  • Singular: Addendum 
  • Plural: Addenda
  • Singular: Alumna 
  • Plural: Alumnae
  • Singular: Alumnus
  • Plural: Alumni 
  • Singular: Analysis
  • Plural: Analyses 
  • Singular: Antenna
  • Plural: Antennas /antennae 
  • Singular: Apparatus
  • Plural: Apparatuses 
  • Singular: Appendix
  • Plural: Appendices/ appendixes 
  • Singular: Axis
  • Plural: Axes

B

  • Singular: Bacillus
  • Plural: Bacilli 
  • Singular: Bacterium
  • Plural: Bacteria 
  • Singular: Basis
  • Plural: Bases 
  • Singular: Beau
  • Plural: Beaux 
  • Singular: Bison
  • Plural: Bison 
  • Singular: Buffalo
  • Plural: Buffalos / buffaloes 
  • Singular: Bureau
  • Plural: Bureaus 
  • Singular: Bus
  • Plural: Busses / buses

C

  • Singular: Cactus
  • Plural: Cactuses / cacti 
  • Singular: Calf
  • Plural: Calves 
  • Singular: Child
  • Plural: Children 
  • Singular: Corps
  • Plural: Corps 
  • Singular: Corpus
  • Plural: Corpora/corpuses 
  • Singular: Crisis
  • Plural: Crises 
  • Singular: Criterion
  • Plural: Criteria 
  • Singular: Curriculum
  • Plural: Curricula 
  • Singular: Datum
  • Plural: Data

D

  • Singular: Deer
  • Plural: Deer 
  • Singular: Die
  • Plural: Dice 
  • Singular: Dwarf
  • Plural: Dwarfs /dwarves 
  • Singular: Diagnosis
  • Plural: Diagnoses
 

See: The Difference Between Few and A few


E

  • Singular: Echo
  • Plural: Echoes 
  • Singular: Elf
  • Plural: Elves 
  • Singular: Ellipsis
  • Plural: Ellipses 
  • Singular: Embargo
  • Plural: Embargoes 
  • Singular: Emphasis
  • Plural: Emphases 
  • Singular: Erratum
  • Plural: Errata

F

  • Singular: Fireman
  • Plural: Firemen 
  • Singular: Fish
  • Plural: Fish/ fishes 
  • Singular: Focus
  • Plural: Focuses 
  • Singular: Foot
  • Plural: Feet 
  • Singular: Formula
  • Plural: Formulas 
  • Singular: Fungus
  • Plural: Fungi / funguses

G

  • Singular: Genus
  • Plural: Genera 
  • Singular: Goose
  • Plural: Geese

H

  • Singular: Half
  • Plural: Halves 
  • Singular: Hero
  • Plural: Heroes 
  • Singular: Hippopotamus
  • Plural: Hippopotami /hippopotamuses 
  • Singular: Hoof
  • Plural: Hoofs / hooves
  • Singular: Hypothesis
  • Plural: Hypotheses

I

  • Singular: Index
  • Plural: Indices / indexes

K

  • Singular: Knife
  • Plural: Knives
 

L

  • Singular: Leaf
  • Plural: Leaves 
  • Singular: Life
    Plural: Lives 
  • Singular: Loaf
  • Plural: Loaves 
  • Singular: Louse
  • Plural: Lice

M

  • Singular: Man
  • Plural: Men 
  • Singular: Matrix
  • Plural: Matrices 
  • Singular: Mean
  • Plural: Means 
  • Singular: Medium
  • Plural: Media 
  • Singular: Memorandum
  • Plural: Memoranda 
  • Singular: Millennium
  • Plural: Millenniums / millennia 
  • Singular: Moose
  • Plural: Moose 
  • Singular: Mosquito
  • Plural: Mosquitoes 
  • Singular: Mouse
  • Plural: Mice

N

  • Singular: Nebula
  • Plural: Nebulae /nebulas 
  • Singular: Neurosis
  • Plural: Neuroses 
  • Singular: Nucleus
  • Plural: Nuclei

O

  • Singular: Oasis
  • Plural: Oases 
  • Singular: Octopus
  • Plural: Octopi /octopuses 
  • Singular: Ovum
  • Plural: Ova 
  • Singular: Ox
  • Plural: Oxen

P

  • Singular: Paralysis
  • Plural: Paralyses 
  • Singular: Parenthesis
  • Plural: Parentheses 
  • Singular: Person
  • Plural: Person 
  • Singular: Phenomenon
  • Plural: Phenomena 
  • Singular: Potato
  • Plural: Potatoes

R

  • Singular: Radius
  • Plural: Radii / radiuses
 

S

  • Singular: Scarf
  • Plural: Scarfs / scarves 
  • Singular: Self
  • Plural: Selves 
  • Singular: Series
  • Plural: Series 
  • Singular: Sheep
  • Plural: Sheep 
  • Singular: Shelf
  • Plural: Shelves 
  • Singular: Scissors
  • Plural: Scissors 
  • Singular: Species
  • Plural: Species 
  • Singular: Stimulus
  • Plural: Stimuli 
  • Singular: Stratum
  • Plural: Strata 
  • Singular: Syllabus
  • Plural: Syllabi / syllabuses 
  • Singular: Symposium
  • Plural: Symposia / symposiums 
  • Singular: Synthesis
  • Plural: Syntheses 
  • Singular: Synopsis
  • Plural: Synopses

T

  • Singular: Tableau
  • Plural: Tableaux 
  • Singular: That
  • Plural: Those 
  • Singular: Thesis
  • Plural: Theses 
  • Singular: Thief
  • Plural: Thieves 
  • Singular: This
  • Plural: These 
  • Singular: Tomato
  • Plural: Tomatoes 
  • Singular: Tooth
  • Plural: Teeth 
  • Singular: Tooth
  • Plural: Torpedoes

V

  • Singular: Vertebra
  • Plural: Vertebrae 
  • Singular: Veto
  • Plural: Vetoes 
  • Singular: Vita
  • Plural: Vitae

W

  • Singular: Watch
  • Plural: Watches 
  • Singular: Wife
  • Plural: Wives 
  • Singular: Wolf
  • Plural: Wolves 
  • Singular: Woman
  • Plural: Women

Z

  • Singular: Zero
  • Plural: Zeros / zeroes

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