pool
Also known as American billiards, it is played on a table with six pockets using 15 object balls and a white ball; the goal is to drive the balls into the pockets in a set order.
cue ball 
White ball the player hits with the cue to hit the other balls and pocket them; it is the only ball that may be hit with the cue.
object balls 
Balls that the player must drive into the pockets in a set order; at the start of the game, they are arranged in a triangle.
pocket 
One of the six holes into which the player must drive the balls.