plural of nouns that don't change its spelling

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there are some nouns that you need not change its spelling when ask for plural form. some are the ff. examples: SINGULAR PLURAL deer deer fish fish food food hair hair we don't need to put an "s" or an "es" to make it plural. i hope i didn't offend anybody. i just wanted everyone to know the correct usage of English words. i didn't mean to hurt anyone.