imbecility vs stupidity

imbecility and stupidity both are nouns.

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

As nouns, imbecility and stupidity are synonyms defined as:

Other synonyms of imbecility include betise, folly, foolishness.

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