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From this question: Why is 'aircrafts' bad English, while 'crafts' is okay?

What those words (like "fish") have in common is they have two different plural forms: for example, "fish" has "fish" and "fishes". "Craft" has "craft" and "crafts". Rather than I'm worried about how to use those different forms, I just want to know what those kind of words are called.

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    I don't think there is any special name for them, other than "really irritating to ELL students" :)
    – Andrew
    Commented Feb 14, 2017 at 0:57

2 Answers 2

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Nouns that have irregular plurals, such as fish, aircraft, mouse, man, are called "irregular nouns" or "irregular plural nouns". The phrase "irregular nouns" is more common.

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As stated in this answer from EL&U, such nouns are referred to as irregular plurals.

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