imbecility vs mistake

imbecility and mistake both are nouns.

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

As nouns, mistake is a hypernym of imbecility; that is, mistake is a word with a broader meaning than imbecility:

imbecility: a stupid mistake
mistake: a wrong action attributable to bad judgment or ignorance or inattention

Other hypernyms of imbecility include error, fault.

imbecility (noun)	mistake (noun)
a stupid mistake	a wrong action attributable to bad judgment or ignorance or inattention
retardation more severe than a moron but not as severe as an idiot	an understanding of something that is not correct
	part of a statement that is not correct

imbecility (verb)	mistake (verb)
	to make a mistake or be incorrect
	identify incorrectly