| The form of the word changes radically. |
| | a duck - ducks |
| | a child - children |
| | a book - books |
| | a brother - brothers |
| | a daughter - daughters |
| | a father - fathers |
| | a foot - feet |
| | a (male) cousin - cousins |
| | a goose - geese |
| | a capital - capitals |
| | a hand - hands |
| | a man - men |
| | a mother - mothers |
| | a night - nights |
| | a sister - sisters |
| | a tooth - teeth |
| | a toe - toes |
| | | |
| | a bicycle - bicycles |
| | a finger - fingers |
| | a course - courses |
| | an eye - eyes |
