bewitchment vs necromancy

bewitchment and necromancy both are nouns.

Word	Noun	Adjective	Verb	Adverb
bewitchment	Yes	No	No	No
necromancy	Yes	No	No	No

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

bewitchment: a magical spell
necromancy: 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, black magic, sorcery.

bewitchment (noun)	necromancy (noun)
a magical spell	conjuring up the dead, especially for prophesying
	the belief in magical spells that harness occult forces or evil spirits to produce unnatural effects in the world