crystal gazing vs prophecy

crystal gazing and prophecy both are nouns.

Word	Noun	Adjective	Verb	Adverb
crystal gazing	Yes	No	No	No
prophecy	Yes	No	No	No

As nouns, prophecy is a hypernym of crystal gazing; that is, prophecy is a word with a broader meaning than crystal gazing:

crystal gazing: staring into a crystal ball to arouse visions of future or distant events
prophecy: knowledge of the future (usually said to be obtained from a divine source)

Other hypernyms of crystal gazing include prognostication, vaticination.

crystal gazing (noun)	prophecy (noun)
staring into a crystal ball to arouse visions of future or distant events	knowledge of the future (usually said to be obtained from a divine source)
	a prediction uttered under divine inspiration