The Helpful List of 35+ Irregular Plural Nouns in English

Irregular plural nouns are nouns that do not become plural by adding -s or -es, as most nouns in the English language do. Here’s all the information you need to recognize and form irregular plurals.

Irregular Plural Noun Definition

An irregular plural noun is an irregular noun in the plural form.  An irregular noun is a noun that becomes plural by changing its spelling in other ways than adding an “s” or “es” to the end of the word. This change can happen in a variety of ways.

For example, the plural form of man is men, not mans. The plural form of woman is women, not womans.

List of Irregular Plurals

Below you’ll find the irregular plural nouns list to help you.

  • Person –> People
  • Foot –> Feet
  • Tooth –> Teeth
  • Child –> Children
  • Mouse –> Mice
  • Sheep –> Sheep
  • Fish –> Fish
  • Leaf –> Leaves
  • Goose –> Geese
  • Woman –> Women
  • Aircraft –> Aircraft
  • Apex –> Apices
  • Bison –> Bison
  • Crisis –> Crises
  • Curriculum –> Curricula
  • Datum –> Data
  • Focus –> Foci
  • Series –> Series
  • Vita –> Vitae
  • Tuna –> Tuna
  • Quiz –> Quizzes
  • Index –> Indices
  • Man –> Men
  • Ellipsis –> Ellipses
  • Codex –> Codies
  • Lavra –> Lavrae
  • Alumni –> Alumnae
  • Erratum –> Errata
  • Ox –> Oxen
  • Oasis –> Oases
  • Swine –> Swine
  • Trout –> Trout
  • Genus –> Genera
  • Focus –> Foci
  • Diagnosis –> Diagnoses
  • Analysis –> Analyses

Irregular Plural Nouns List Infographic

List of Irregular Plurals in English

Irregular Plural Nouns

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