mystic vs believer

mystic and believer both are nouns.

Word	Noun	Adjective	Verb	Adverb
mystic	Yes	Yes	No	No
believer	Yes	No	No	No

As nouns, believer is a hypernym of mystic; that is, believer is a word with a broader meaning than mystic:

mystic: someone who believes in the existence of realities beyond human comprehension
believer: a person who has religious faith

Other hypernyms of mystic include worshiper, worshipper.

mystic (noun)	believer (noun)
someone who believes in the existence of realities beyond human comprehension	a person who has religious faith
	a supporter who accepts something as true

mystic (adjective)	believer (adjective)
relating to or characteristic of mysticism
relating to or resembling mysticism
having an import not apparent to the senses nor obvious to the intelligence; beyond ordinary understanding