art history vs humanities

art history and humanities both are nouns.

Word	Noun	Adjective	Verb	Adverb
art history	Yes	No	No	No
humanities	Yes	No	No	No

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

art history: the academic discipline that studies the development of painting and sculpture
humanities: studies intended to provide general knowledge and intellectual skills (rather than occupational or professional skills)

Other hypernyms of art history include arts, humanistic discipline, liberal arts.

art history (noun)	humanities (noun)
the academic discipline that studies the development of painting and sculpture	studies intended to provide general knowledge and intellectual skills (rather than occupational or professional skills)