IRREGULAR PLURALS

📘 Common Irregular Plural Nouns in English

Singular	Plural	Notes
man	men	vowel change
woman	women	pronounced /ˈwɪmɪn/
child	children	adds -ren
person	people	completely different word
tooth	teeth	vowel change
foot	feet	vowel change
mouse	mice	vowel change
goose	geese	vowel change
ox	oxen	rare -en plural
cactus	cacti	Latin origin
focus	foci	Latin origin
fungus	fungi	Latin origin
analysis	analyses	-is → -es (Greek origin)
crisis	crises	-is → -es
thesis	theses	-is → -es
phenomenon	phenomena	-on → -a
criterion	criteria	-on → -a
index	indices / indexes	indices in maths; indexes in publishing
appendix	appendices	appendixes also accepted in medical contexts
deer	deer	same form
sheep	sheep	same form
fish	fish	same form (or fishes when referring to species)

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