tomfoolery vs frivolity

tomfoolery and frivolity both are nouns.

Word	Noun	Adjective	Verb	Adverb
tomfoolery	Yes	No	No	No
frivolity	Yes	No	No	No

As nouns, frivolity is a hyponym of tomfoolery; that is, frivolity is a word with a more specific, narrower meaning than tomfoolery:

Other hyponyms of tomfoolery include meshugaas, mishegaas, mishegoss, buffoonery, clowning, harlequinade, japery, prank.

tomfoolery (noun)	frivolity (noun)
foolish or senseless behavior	acting like a clown or buffoon
	something of little value or significance
	the trait of being frivolous; not serious or sensible