a person or thing that bores or pierces.

Machinery . a tool used for boring; auger.

Zoology .

any of several insects that bore into trees, fruits, etc., esp. a beetle that bores into the woody part of plants.

any of various mollusks, worms, etc., that bore into wood, stone, coral, or shells.

a marsipobranch fish, as a hagfish, that bores into other fishes to feed on their flesh.