fungus
fungi
wife
wives
tooth
teeth
woman
women
man
men
wolf
wolves
leaf
leaves
moose
moose
cactus
cacti
knife
knives
elf
elves
life
lives
mouse
mice
fish
fish
die
dice
person
people
deer
deer
goose
geese
ox
oxen
series
series
sheep
sheep
loaf
loaves
scarf
scarves
aircraft
aircraft
foot
feet
child
children
half
halves