heretic vs misbeliever

heretic and misbeliever both are nouns.

Word	Noun	Adjective	Verb	Adverb
heretic	Yes	No	No	No
misbeliever	Yes	No	No	No

As nouns, heretic and misbeliever are synonyms defined as:

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

Other synonyms of heretic include religious outcast.

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