foolishness vs folly

foolishness and folly both are nouns.

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

As nouns, foolishness and folly are synonyms defined as:

Other synonyms of foolishness include betise, imbecility, stupidity.

As nouns, foolishness and folly are synonyms defined as:

Other synonyms of foolishness include unwiseness.

As nouns, foolishness and folly are synonyms defined as:

Other synonyms of foolishness include craziness, madness.

foolishness (noun)	folly (noun)
a stupid mistake	foolish or senseless behavior
the trait of acting stupidly or rashly	a stupid mistake
the quality of being rash and foolish	the trait of acting stupidly or rashly
	the quality of being rash and foolish