Rastafarian vs adherent

Rastafarian and adherent both are nouns.

Word	Noun	Adjective	Verb	Adverb
Rastafarian	Yes	Yes	No	No
adherent	Yes	Yes	No	No

As nouns, adherent is a hypernym of Rastafarian; that is, adherent is a word with a broader meaning than Rastafarian:

Other hypernyms of Rastafarian include disciple.

Rastafarian (noun)	adherent (noun)
(Ethiopia) adherents of an African religion that regards Ras Tafari as divine	someone who believes and helps to spread the doctrine of another
follower of Rastafarianism

Rastafarian (adjective)	adherent (adjective)
of or pertaining to or characteristic of Rastafarianism or Rastafarians	sticking fast