stopper
1. stop.per \'sta:p-*r\ n 1: one that brings to a halt or causes to stop operating or functioning : CHECK 2: one that closes, shuts, or fills up; specif : something (as a bu ng or cork) used to plug an opening 2. stopper \-(*-)rin\ vt or stop.per.ing : to close or secure with or as if with a stopper