necromancy vs foretelling

necromancy and foretelling both are nouns.

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

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

necromancy: conjuring up the dead, especially for prophesying
foretelling: the art or gift of prophecy (or the pretense of prophecy) by supernatural means

Other hypernyms of necromancy include divination, fortune telling, soothsaying.

necromancy (noun)	foretelling (noun)
conjuring up the dead, especially for prophesying	the art or gift of prophecy (or the pretense of prophecy) by supernatural means
the belief in magical spells that harness occult forces or evil spirits to produce unnatural effects in the world	a statement made about the future