boy
boys
child
children
tooth
teeth
kangaroo
kangaroos
mouse
mice
wolf
wolves
whale
whales
leaf
leaves
crocodile
crocodiles
goose
geese
sheep
sheep
giraffe
giraffes
foot
feet
deer
deer
parent
parents
lion
lions
strawberry
strawberries
fish
fish
knife
knives
person
people
horse
horses
grandparent
grandparents
penguin
penguins
hippo
hippos