religious outcast vs heretic

religious outcast and heretic both are nouns.

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

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

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

Other synonyms of religious outcast include misbeliever.

religious outcast (noun)	heretic (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
	a person who holds unorthodox opinions in any field (not merely religion)