What rhymes with whacker

attacker, backtracker, barebacker, blacker, clacker, claquer, counterattacker, feedbacker, flaker, greenbacker, hacker, horsebacker, jacker, lakher, macer, quacker, racker, sacer, sacker, shacker, stacker, switchbacker, tacker, thwacker, unpacker, whacker, wisecracker, wracker