superior skill vs ability

superior skill and ability both are nouns.

Word	Noun	Adjective	Verb	Adverb
superior skill	Yes	No	No	No
ability	Yes	No	No	No

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

superior skill: more than ordinary ability
ability: possession of the qualities (especially mental qualities) required to do something or get something done

Other hypernyms of superior skill include power.

superior skill (noun)	ability (noun)
more than ordinary ability	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