Peculiar Plurals

Irregular Changes

• goose → geese
• mouse → mice
• child → children
• man → men
• woman → women
• tooth → teeth
• foot → feet
• louse → lice

Latin/Greek Origins

• cactus → cacti
• fungus → fungi
• nucleus → nuclei
• criterion → criteria
• phenomenon → phenomena
• datum → data
• thesis → theses
• analysis → analyses

Invariable Plurals

• sheep → sheep
• deer → deer
• fish → fish
• aircraft → aircraft
• series → series
• species → species
• barracks → barracks
• moose → moose