plunger

n 1 part of a mechanism that moves up and down 柱塞; 活塞. 2 (in plumbing) rubber cup fixed on a handle, used for clearing a blocked pipe by means of suction （疏通管道的）搋子.

pluck, pluckily, plucky, plug, plug-hole, plum, plum pudding, plumage, plumb, plumb-line, plumber, plumbing, plume, plummet, plummy, plump, plumpness, plunder, plunderer, plunge, plunk, pluperfect, plural, pluralism, pluralist, pluralist (also pluralistic), plurality, plus, plus-fours, plush, plushiness, plushy, Pluto, plutocracy, plutocrat, plutocratic, plutonium, ply, plywood, PM,