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The only ones I know of:
Octopus : Octopi
Crisis : Crises
Are there any other unusual cases?
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scissors you cannot say scissor , I have no idea why.
hair but not hairs.
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Ox: Oxen
Child: Children
Brother: Brethren
Foot: Feet
Man: Men
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people people peoples
fish fish fishes
axis axes
matrix matrices
rubrik rubrika
forum forums fora
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Unless you're referring to a person i.e. 'The loves of her life.
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***hair but not hairs***
Think again on this one, madam.
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I'm so sorry, but could you tell hairs? Damian of Edinburgh? Where is your good sence of humour?
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Little explanation for those who doesn't speak my native language. In my language we have plural for hair. Example: Tia ima chudesni zlatisti kosi. (Translation: She has wonderful gold hairs) (kosi - plural). Tia ima rusa kosa. (She has blond hair). Nikoi ne moje da gali kosite ti , kakto men. Nobody can touch your hairs as me.
For example we have the same problem with scissors: edna nojica (one scissor), dve nojici (two scissors). In english you accept that scissors is a pair, but in my own language it's not.
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"Brother: Brethren "
This is wrong. Brothers is plural of brother. Brethren is a mass noun, a somewhat old-fashioned term referring to one's ideological peers.
Hair as a mass noun has no plural. But if you're referring to a single strand of hair, then hair can be a counting noun. "Hairs" then would refer to multiple strands of hairs. Hairs is used, particularly by the medical profession.
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goose geese
moose moose
deer deer
louse lice
woman women
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spouse spice
wuss weasel
boot beet
vow vowel
Roman Romen
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"This is wrong. Brothers is plural of brother. Brethren is a mass noun, a somewhat old-fashioned term referring to one's ideological peers. "
From etymonline: Alternate pl. brethren was predominant c.1200-1600s, but survived only in religious usage.
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