foreknowledge vs clairvoyance

foreknowledge and clairvoyance both are nouns.

Word	Noun	Adjective	Verb	Adverb
foreknowledge	Yes	No	No	No
clairvoyance	Yes	No	No	No

As nouns, clairvoyance is a hypernym of foreknowledge; that is, clairvoyance is a word with a broader meaning than foreknowledge:

foreknowledge: knowledge of an event before it occurs
clairvoyance: apparent power to perceive things that are not present to the senses

Other hypernyms of foreknowledge include E.S.P., ESP, extrasensory perception, second sight.

foreknowledge (noun)	clairvoyance (noun)
knowledge of an event before it occurs	apparent power to perceive things that are not present to the senses