religious outcast vs misbeliever

religious outcast and misbeliever both are nouns.

Word	Noun	Adjective	Verb	Adverb
religious outcast	Yes	No	No	No
misbeliever	Yes	No	No	No

As nouns, religious outcast and misbeliever are synonyms defined as:

religious outcast and misbeliever: a person who holds religious beliefs in conflict with the dogma of the Roman Catholic Church

Other synonyms of religious outcast include heretic.

religious outcast (noun)	misbeliever (noun)
a person who holds religious beliefs in conflict with the dogma of the Roman Catholic Church	a person who holds religious beliefs in conflict with the dogma of the Roman Catholic Church