1. A small body of standing water (rainwater) or other liquid; SYN. puddle.
2. A hole that is (usually) filled with water.
3. Something resembling a pool of liquid; SYN. puddle.
4. Any of various games played on a pool table having 6 pockets; SYN. pocket billiards.
5. The combined stakes of the betters; SYN. kitty.
6. Any communal combination of funds
7. An organization of people or resources that can be shared

1. To add together, as of resources; SYN. combine.
2. To combine into a common fund
3. To form a pool of liquid

Or pocket billiards; Game derived from billiards and played in many different forms. Originally popular in the us, it is now also played in Europe.
It is played with balls of different colors, each of which is numbered. The neutral ball (black) is the number eight ball. The most popular form of pool is eight-ball pool in which players have to sink all their own balls before the opponent, and then must sink the eight-ball to win the game. Other forms include sinking balls in numerical order (rotation), or sinking a designated ball into a designated pocket (straight pool).