borer:
(plural: ‘borers‘)
a person who makes round holes as a job, especially an assistant carpenter,

a borer (person) boring holes in a piece of wood with a bore (a tool)
e.g.
Every senior carpenter of the past used to have a borer to make holes in the planks or reapers to be joined or attached.
The durability of a piece of wooden furniture depends more on the borer who must make neat holes at exact places so that the joints fit in tight and well.

a wood borer (the larva of an insect living in a piece of wood)
Note: ‘Borer’ is more commonly used to refer to an insect and insect larva, such as ‘cotton borer’, ‘wood borer’, ‘ash borer’, etc.
To know how carpenters bore holes in wood, please click here, to got to a web site (with a video).
