folly vs foolishness

folly and foolishness both are nouns.

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

As nouns, folly and foolishness are synonyms defined as:

Other synonyms of folly include betise, imbecility, stupidity.

As nouns, folly and foolishness are synonyms defined as:

Other synonyms of folly include unwiseness.

As nouns, folly and foolishness are synonyms defined as:

Other synonyms of folly include craziness, madness.

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