black art vs magic

black art and magic both are nouns.

Word	Noun	Adjective	Verb	Adverb
black art	Yes	No	No	No
magic	Yes	Yes	No	No

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

black art: the belief in magical spells that harness occult forces or evil spirits to produce unnatural effects in the world
magic: any art that invokes supernatural powers

Other hypernyms of black art include thaumaturgy.

black art (noun)	magic (noun)
the belief in magical spells that harness occult forces or evil spirits to produce unnatural effects in the world	an illusory feat; considered magical by naive observers
	any art that invokes supernatural powers

black art (adjective)	magic (adjective)
	possessing or using or characteristic of or appropriate to supernatural powers