chump, clump, crump, dump, frump, grump, gump, gumpp, hump, jump, klump, klumpp, kump, lump, lumpp, plump, pump, rump, slump, stump, stumpe, stumpp, sump, thump, trump
2 syllables:
air pump, broad jump, force pump, gas pump, hand pump, heat pump, high jump, lift pump, long jump, oil pump, pole jump, ski jump, sump pump, trash dump, tree stump
3 syllables:
donkey pump, garbage dump, get the jump, ion pump, rubbish dump, stirrup pump, stomach pump, suction pump, vacuum pump, water jump, water pump
4 syllables:
bicycle pump, diffusion pump, gasoline pump, hydraulic pump, spectator pump, toxic waste dump
5 syllables:
auxiliary pump, centrifugal pump, condensation pump
i win.