An abyss is a space that you cannot measure how deep it is. It can also be used to refer to anything you cannot measure or comprehend, eg "the abyss of the soul".
A bore is a kind of drilled well. Water is drawn up from underground through the bore hole by some kind of pump. The pump can be an electric pump, a hand pump, or a wind driven pump.
Bis forBullethole
A bullethole, or bullet hole is simply a hole that is made by a bullet passing through an object.
A crater is a large, circular hole in the ground that could have been caused by several different things. Craters can be many kilometers wide and very deep.
Craters are found on top of volcanoes, and they can be caused by meteors hitting the Earth. They are sometimes caused when the ground collapses above a large underground chamber like an old mine or a cave.
A dent is a hollow, like a shallow hole in a surface. Dents are usually caused by hitting something. The car in the picture has a dent in its side.