stupidity vs imbecility

stupidity and imbecility both are nouns.

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

As nouns, stupidity and imbecility are synonyms defined as:

Other synonyms of stupidity include betise, folly, foolishness.

stupidity (noun)	imbecility (noun)
a stupid mistake	a stupid mistake
a poor ability to understand or to profit from experience	retardation more severe than a moron but not as severe as an idiot