necromancer vs diviner

necromancer and diviner both are nouns.

Word	Noun	Adjective	Verb	Adverb
necromancer	Yes	No	No	No
diviner	Yes	No	No	No

As nouns, diviner is a hypernym of necromancer; that is, diviner is a word with a broader meaning than necromancer:

necromancer: one who practices divination by conjuring up the dead
diviner: someone who claims to discover hidden knowledge with the aid of supernatural powers

necromancer (noun)	diviner (noun)
one who practices magic or sorcery	someone who claims to discover hidden knowledge with the aid of supernatural powers
one who practices divination by conjuring up the dead