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We use no meaning not any, as an adjective to qualify the noun. If the noun already qualified by an adjective, like any, much, enough, we must use the adverb not.
We only use no as an adverb before a comparative: I have no more to say.
Plenty isn't an adjective, but a noun meaning a large number or amount. The adjective is plentiful: Oranges are cheap now because they are plentiful
Others isn't an adjective but a pronoun. The adjective is other (without the s) We can say: The others aren't here, omitting the noun boys.