Synonyms and related words :
abjuratory, apostate, backslider, bolter, breakaway, collaborationist, collaborator, convert, defector, demurrer, deserter, dissenter, dissentient, dissident, fifth columnist, misbeliever, mugwump, mugwumpian, mugwumpish, nonconformist, objector, opinionist, opposition voice, proselyte, protestant, protester, quisling, recidivist, recreant, recusant, renegade, renegado, renegate, renunciative, renunciatory, repudiative, repudiatory, reversionist, revocatory, runagate, schismatic, seceder, secessionist, sectarian, sectary, strikebreaker, tergiversant, tergiversator, traitor, turnabout, turncoat, turntail