precognition vs clairvoyance

precognition and clairvoyance both are nouns.

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

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

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

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

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