arithmancy vs foretelling

arithmancy and foretelling both are nouns.

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

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

arithmancy: divination by means of numbers
foretelling: the art or gift of prophecy (or the pretense of prophecy) by supernatural means

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

arithmancy (noun)	foretelling (noun)
divination by means of numbers	the art or gift of prophecy (or the pretense of prophecy) by supernatural means
	a statement made about the future