Irregular Plurals

There are two types of irregular plurals:

  1. Words that don't change.
  2. Words that don't follow plural spelling rules.

Words That Don't Change

These words are the same in the singular and plural form.

Words With the Same Singular and Plural Forms
Singular (1)Plural (2+)
aircraftaircraft
deerdeer
fishfish
moosemoose
offspringoffspring
sheepsheep
speciesspecies
salmonsalmon
trouttrout

Many of these words refer to animals. A lot of fish names also follow this pattern.

Words That Don't Follow Plural Spelling Rules

Irregular Plurals
Singular (1)Plural (2+)
childchildren
diedice
footfeet
goosegeese
louselice
manmen
mousemice
oxoxen
personpeople
toothteeth
womanwomen

Many compound words that end with an irregular plural follow the same pattern.

Irregular Plurals
Singular (1)Plural (2+)
workmanworkmen
schoolchildSchoolchildren

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