Young Turk, apostate, backslider, bolter, breakaway, collaborationist, collaborator, convert, defector, demurrer, denominationalist, deserter, dissenter, dissentient, dissident, divisive, factionist, fifth columnist, heretical, heterodox, misbeliever, mugwump, nonconformist, objector, opinionist, opposition voice, proselyte, protestant, protester, quisling, radical, rebellious, recidivist, recreant, recusant, renegade, renegado, renegate, reversionist, runagate, schismatical, seceder, secessionist, sectarian, sectary, separatist, skeptic, strikebreaker, tergiversant, tergiversator, traitor, turnabout, turncoat, turntail, unconventional, unorthodox