fanboy vs devotee

fanboy and devotee both are nouns.

Word	Noun	Adjective	Verb	Adverb
fanboy	Yes	No	No	No
devotee	Yes	No	No	No

As nouns, devotee is a hypernym of fanboy; that is, devotee is a word with a broader meaning than fanboy:

fanboy: A male fan who is obsessive about a particular subject (especially, someone or something in popular entertainment media
devotee: an ardent follower and admirer

Other hypernyms of fanboy include buff, fan, lover, adult male, man.

fanboy (noun)	devotee (noun)
A male fan who is obsessive about a particular subject (especially, someone or something in popular entertainment media	an ardent follower and admirer