adaptability vs ability

adaptability and ability both are nouns.

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

As nouns, ability is a hypernym of adaptability; that is, ability is a word with a broader meaning than adaptability:

adaptability: the ability to change (or be changed) to fit changed circumstances
ability: the quality of being able to perform; a quality that permits or facilitates achievement or accomplishment

adaptability (noun)	ability (noun)
the ability to change (or be changed) to fit changed circumstances	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