Playing tennis is a lot of fun.
Is this a structure of [adjective: a lot of][noun: fun] or [adverb: a lot of][adjective: fun]?
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Fun is a noun. There are many derivatives of the word. Funny is a proper adjective. Funster is someone who likes to have a good time. Fun as a verb goes into the same basket with office and movie both of which are convenient shorthand for people too lazy to put together a proper sentence. Fun as an adjective, along with "funner" and "funnest" create for me, as well as other educated people I know, an effect similar to fingernails on a blackboard. But for most people, they could (sic) care less.