bewitchment vs black magic

bewitchment and black magic both are nouns.

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

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

bewitchment: a magical spell
black magic: the belief in magical spells that harness occult forces or evil spirits to produce unnatural effects in the world

Other hypernyms of bewitchment include black art, necromancy, sorcery.

bewitchment (noun)	black magic (noun)
a magical spell	the belief in magical spells that harness occult forces or evil spirits to produce unnatural effects in the world