art vs superior skill

art and superior skill both are nouns.

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

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

art: a superior skill that you can learn by study and practice and observation
superior skill: more than ordinary ability

art (noun)	superior skill (noun)
the creation of beautiful or significant things	more than ordinary ability
the products of human creativity; works of art collectively
a superior skill that you can learn by study and practice and observation
photographs or other visual representations in a printed publication