folly vs prank

folly and prank both are nouns.

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

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

Other hyponyms of folly include meshugaas, mishegaas, mishegoss, buffoonery, clowning, frivolity, harlequinade, japery.

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

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