List of irregular plural nouns

A regular plural is a Word that forms the plural by adding an -s or an -es to the end of the Word.

An irregular plural is a Word that forms the plural in some other way. Some examples of irregular plural nouns are:

• alumna > alumnae
• alumnus > alumni
• child > children
• crisis > crises
• datum > data
• foot > feet
• formula > formulae
• goose > geese
• index > indices
• man > men
• matrix > matrices
• medium > media
• mouse > mice
• ox > oxen
• tooth > teeth
• woman > women
• kibbutz > kibbutzim