heresiarch

a person who believes, teaches, or advocates something opposed to accepted beliefs his about-face on welfare reform has led him to be seen as a heresiarch among his party's faithful Synonyms dissenter, dissentient, dissident, heretic, nonconformistRelated Words apostate, defector, renegade; schismatic, sectarian, separationist, separatist; disbeliever, infidel, misbeliever, unbeliever; bohemian, individualistNear Antonyms believerAntonyms conformer, conformist