inability vs cognition

inability and cognition both are nouns.

Word	Noun	Adjective	Verb	Adverb
inability	Yes	No	No	No
cognition	Yes	No	No	No

As nouns, cognition is a hypernym of inability; that is, cognition is a word with a broader meaning than inability:

inability: lack of ability (especially mental ability) to do something
cognition: the psychological result of perception and learning and reasoning

Other hypernyms of inability include knowledge, noesis.

inability (noun)	cognition (noun)
lacking the power to perform	the psychological result of perception and learning and reasoning
lack of ability (especially mental ability) to do something