pounder

pound (“verb”) +‎ -er (“agent suffix”)

pounder (plural pounders)

1. A vessel in which something is pounded, or an implement used in pounding.
   • 2014, The Cook's Illustrated Meat Book

     Since we often prefer to pound our own cutlets rather than buy uneven precut cutlets from the store, a meat pounder is an important piece of equipment.

• mortar and pestle

pound (“measure of weight”) +‎ -er

pounder (plural pounders)

1. (in combination) A gun capable of firing a specified weight of shot in pounds.

   The ship fired the twelve-pounder twice during the battle.

2. (in combination) Something that weighs a specified number of pounds.
   • 1970, Field & Stream (volume 75, number 7, page 76)

     "Okay, that's a keeper," Harold said as he netted the 3-pounder and put him on a stringer over the side of the boat.

3. (in combination) Something or someone costing so many pounds sterling.

   The striker they bought from United was a million-pounder.

• quarter-pounder

• unroped