impertinence vs fun

impertinence and fun both are nouns.

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

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

Other hypernyms of impertinence include playfulness.

impertinence (noun)	fun (noun)
inappropriate playfulness	activities that are enjoyable or amusing
the trait of being rude and impertinent; inclined to take liberties	violent and excited activity
an impudent statement	a disposition to find (or make) causes for amusement
	verbal wit or mockery (often at another's expense but not to be taken seriously)