borer

noun

1. a person or thing that bores or pierces.
2. Machinery. a tool used for boring; auger.
3. Zoology.
   1. any of several insects that bore into trees, fruits, etc., especially a beetle that bores into the woody part of plants.
   2. any of various mollusks, worms, etc., that bore into wood, stone, coral, or shells.
4. a marsipobranch fish, as a hagfish, that bores into other fishes to feed on their flesh.

noun

1. a machine or hand tool for boring holes
2. any of various insects, insect larvae, molluscs, or crustaceans that bore into rock or plant material, esp woodSee also woodborer, corn borer, marine borer, rock borer