pounder in WordNet English dictionary

1. a heavy tool of stone or iron (usually with a flat base and a handle) that is used to grind and mix material (as grain or drugs or pigments) against a slab of stone
   pestle  muller  pounder 
   
2. (used only in combination) something weighing a given number of pounds
   "the fisherman caught a 10-pounder"; "their linemen are all 300-pounders"
   pounder