imbecility vs foolishness

imbecility and foolishness both are nouns.

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

As nouns, imbecility and foolishness are synonyms defined as:

Other synonyms of imbecility include betise, folly, stupidity.

imbecility (noun)	foolishness (noun)
a stupid mistake	a stupid mistake
retardation more severe than a moron but not as severe as an idiot	the trait of acting stupidly or rashly
	the quality of being rash and foolish