witchery vs black magic

witchery and black magic both are nouns.

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

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

witchery: the art of sorcery
black magic: the belief in magical spells that harness occult forces or evil spirits to produce unnatural effects in the world

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

witchery (noun)	black magic (noun)
the art of sorcery	the belief in magical spells that harness occult forces or evil spirits to produce unnatural effects in the world