Definitions of pool:

• noun:   any of various games played on a pool table having 6 pockets
• noun:   an excavation that is (usually) filled with water
• noun:   an organization of people or resources that can be shared

  Example: "A car pool"

• noun:   something resembling a pool of liquid

  Example: "He stood in a pool of light"

• noun:   a small body of standing water (rainwater) or other liquid

  Example: "The body lay in a pool of blood"

• noun:   the combined stakes of the betters
• noun:   any communal combination of funds

  Example: "Everyone contributed to the pool"

• noun:   an association of companies for some definite purpose
• noun:   a small lake
• verb:   combine into a common fund

  Example: "We pooled resources"

• verb:   join or form a pool of people
• name:  A surname (common: 1 in 16666 families; popularity rank in the U.S.: #1990)