Singular to Plural (Irregular nouns)

• child

  children
• foot


  feet
• tooth


  teeth
• mouse


  mice
• man


  men
• woman


  women
• goose


  geese
• person


  people
• ox


  oxen
• fish


  fish
• die


  dice
• deer


  deer
• moose


  moose
• aircraft


  aircraft
• cactus


  cacti or cactuses
• crisis


  crises
• datum


  data
• criterion


  criteria
• thesis


  theses
• analysis


  analyses
• bacterium


  bacteria
• appendix


  appendices
• axis


  axes
• louse


  lice
• medium


  media
• phenomenon


  phenomena
• curriculum


  curriculums or curricula
• memorandum


  memorandums or memoranda
• focus


  focuses or foci
• radius


  radii
• alumnus


  alumni
• codex


  codies
• larva


  larvae
• oasis


  oases
• swine


  swine
• diagnosis


  diagnoses
• series


  series
• quiz


  quizzes
• tuna


  tuna
• vita


  vitae