comedy vs fun

comedy and fun both are nouns.

Word	Noun	Adjective	Verb	Adverb
comedy	Yes	No	No	No
fun	Yes	No	No	No

As nouns, fun is a hypernym of comedy; that is, fun is a word with a broader meaning than comedy:

comedy: a comic incident or series of incidents
fun: verbal wit or mockery (often at another's expense but not to be taken seriously)

Other hypernyms of comedy include play, sport.

comedy (noun)	fun (noun)
light and humorous drama with a happy ending	activities that are enjoyable or amusing
a comic incident or series of incidents	violent and excited activity
	a disposition to find (or make) causes for amusement
	verbal wit or mockery (often at another's expense but not to be taken seriously)