pounder

Noun

• 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

• (used only in combination) something weighing a given number of pounds
  • the fisherman caught a 10-pounder
    
  • their linemen are all 300-pounders
    

Related words

• Synonyms: 
  pestle , muller