black art vs obiism

black art and obiism both are nouns.

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

As nouns, obiism is a hyponym of black art; that is, obiism is a word with a more specific, narrower 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
obiism: belief in a kind of sorcery that originated in Africa and is practiced in the West Indies

Other hyponyms of black art include witchcraft, witchery, bewitchment, enchantment, demonism, diabolism, Satanism.

black art (noun)	obiism (noun)
the belief in magical spells that harness occult forces or evil spirits to produce unnatural effects in the world	belief in a kind of sorcery that originated in Africa and is practiced in the West Indies