religious mystic vs believer

religious mystic and believer both are nouns.

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

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

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

Other hypernyms of religious mystic include worshiper, worshipper.

religious 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