prank vs folly

prank and folly both are nouns.

Word	Noun	Adjective	Verb	Adverb
prank	Yes	No	Yes	No
folly	Yes	No	No	No

As nouns, folly is a hypernym of prank; that is, folly is a word with a broader meaning than prank:

Other hypernyms of prank include craziness, foolery, indulgence, lunacy, tomfoolery.

prank (noun)	folly (noun)
a ludicrous or grotesque act done for fun and amusement	foolish or senseless behavior
acting like a clown or buffoon	a stupid mistake
	the trait of acting stupidly or rashly
	the quality of being rash and foolish

prank (verb)	folly (verb)
dress up showily
dress or decorate showily or gaudily