fetishist vs deviant

fetishist and deviant both are nouns.

Word	Noun	Adjective	Verb	Adverb
fetishist	Yes	No	No	No
deviant	Yes	Yes	No	No

As nouns, deviant is a hypernym of fetishist; that is, deviant is a word with a broader meaning than fetishist:

fetishist: one who engages in fetishism (especially of a sexual nature)
deviant: a person whose behavior deviates from what is acceptable especially in sexual behavior

Other hypernyms of fetishist include degenerate, deviate, perv, perve, pervert.

fetishist (noun)	deviant (noun)
one who engages in fetishism (especially of a sexual nature)	a person whose behavior deviates from what is acceptable especially in sexual behavior

fetishist (adjective)	deviant (adjective)
	markedly different from an accepted norm