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