spook vs apparition

spook and apparition both are nouns.

Word	Noun	Adjective	Verb	Adverb
spook	Yes	No	Yes	No
apparition	Yes	No	No	No

As nouns, apparition is a hypernym of spook; that is, apparition is a word with a broader meaning than spook:

Other hypernyms of spook include fantasm, phantasm, phantasma, phantom, shadow.

spook (noun)	apparition (noun)
a mental representation of some haunting experience	an act of appearing or becoming visible unexpectedly
someone unpleasantly strange or eccentric	something existing in perception only
	the appearance of a ghostlike figure
	a ghostly appearing figure

spook (verb)	apparition (verb)
frighten or scare, and often provoke into a violent action