ability vs creativeness

ability and creativeness both are nouns.

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

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

ability: possession of the qualities (especially mental qualities) required to do something or get something done
creativeness: the ability to create

ability (noun)	creativeness (noun)
the quality of being able to perform; a quality that permits or facilitates achievement or accomplishment	the ability to create
possession of the qualities (especially mental qualities) required to do something or get something done