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