Common Irregular Plural Nouns in English

Learn the difference between plural and singular nouns; and different ways to form Common Irregular Plural Nouns in English with list and examples.

Although most nouns have plurals formed according to regular rules, some nouns have unusual, or irregular plurals…

While most nouns are easily made plural with a few simple changes, such as adding an “s” or “es” to the end of the word, there is one group of nouns that doesn’t seem to follow the rules.  They’re called irregular nouns and you guessed it…they don’t become plural the “regular” way.

List of Common Irregular Plural Nouns

In a few words, the singular form is used for both singular and plural.

• Fish – fish
• Deer – deer
• Sheep – sheep
• Shrimp – shrimp
• Offspring – offspring
• Series – series  
• Species – species  
• Means- means
• Grapefruit – grapefruit
• Aircraft – aircraft

Other plural nouns in English:

• Mouse – mice
• Louse – lice
• Foot – feet
• Tooth – teeth
• Goose – geese
• Louse – lice
• Ox – oxen
• Foot – feet
• Child – children
• Man – men
• Woman – women
• Person – people
• Criterion  – criteria
• Bacterium  – bacteria
• Curriculum – curricula
• Medium –  media
• Memorandum  – memoranda
• Species – species
• Stimulus -stimuli
• Stratum  – strata
• Swine -swine
• …

Common Irregular Plural Nouns | Image