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bacterium
bacteria
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moose
moose
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penny
pence (BrE)
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sheep
sheep
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man
men
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child
children
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goose
geese
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woman
women
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phenomenon
phenomena
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shrimp
shrimp
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cactus
cacti / cactuses
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tooth
teeth
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dice
dice (originally singular 'die' plural 'dice')
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thesis
theses
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hero
heroes
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ox
oxen
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foot
feet
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criterion
criteria
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fish
fish / FISHES only when referring to different types of fish/
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buffalo
buffalo
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datum
data
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life
lives
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calf
calves
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fungus
fungi
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crisis
crises
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person
people / PERSONS only in legal contexts, or on purpose/
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analysis
analyses
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deer
deer
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mouse
mice
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torpedo
torpedoes
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