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100

fish

fish

100

child

children

100

man

men

100

woman

women

200

person

people

200

foot

feet

200

tooth

teeth

200

goose

geese

300

shrimp

shrimp

300

mouse

mice

300

moose

moose

300

deer

deer

400

penny (in British usage)

pence

400

thesis

theses

400

cactus

cacti

400

ox

oxen

500

bacterium

bacteria

500

vortex

vortices

500

criterion

criteria

500

datum

data