Sabbath-breaker, absconder, apostasy, apostate, atheist, backslider, betrayal, blasphemer, bolt, bolter, breakaway, collaborationist, collaborator, convert, defection, defector, dereliction, desertion, escapee, fifth columnist, fugitive, mugwump, outlaw, proselyte, quisling, rat, ratting, recidivist, recreant, renegade, renegado, renegate, reversionist, runagate, runaway, sacrilegist, schism, schismatic, seceder, secession, secessionist, separatist, strikebreaker, tergiversant, tergiversator, traitor, turnabout, turncoat, turntail, unbeliever, walkout