cognition vs ability

cognition and ability both are nouns.

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

As nouns, ability is a hyponym of cognition; that is, ability is a word with a more specific, narrower meaning than cognition:

cognition: the psychological result of perception and learning and reasoning
ability: possession of the qualities (especially mental qualities) required to do something or get something done

cognition (noun)	ability (noun)
the psychological result of perception and learning and reasoning	the quality of being able to perform; a quality that permits or facilitates achievement or accomplishment
	possession of the qualities (especially mental qualities) required to do something or get something done