sorcery vs diabolism

sorcery and diabolism both are nouns.

Word	Noun	Adjective	Verb	Adverb
sorcery	Yes	No	No	No
diabolism	Yes	No	No	No

As nouns, diabolism is a hyponym of sorcery; that is, diabolism is a word with a more specific, narrower meaning than sorcery:

sorcery: the belief in magical spells that harness occult forces or evil spirits to produce unnatural effects in the world
diabolism: a belief in and reverence for devils (especially Satan)

Other hyponyms of sorcery include witchcraft, witchery, bewitchment, enchantment, demonism, Satanism, obiism.

sorcery (noun)	diabolism (noun)
the belief in magical spells that harness occult forces or evil spirits to produce unnatural effects in the world	a belief in and reverence for devils (especially Satan)