pool (Noun) — An excavation that is (usually) filled with water.
pool (Noun) — A small lake. ex. "the pool was too small for sailing"
pool (Noun) — An organization of people or resources that can be shared. ex. "a car pool" ex. "a secretarial pool" ex. "when he was first hired he was assigned to the pool"
pool (Noun) — A group of individuals or companies formed to transact some specific business or to promote a common interest.
pool (Noun) — Any communal combination of funds. ex. "everyone contributed to the pool"
pool (Noun) — A small body of standing water (rainwater) or other liquid. ex. "the body lay in a pool of blood"
pool (Noun) — The combined stakes of the betters.
pool (Noun) — Something resembling a pool of liquid. ex. "he stood in a pool of light"
pool (Noun) — Any of various games played on a pool table having 6 pockets.
pool (Verb) — Combine into a common fund. ex. "We pooled resources"
pool (Verb) — Join or form a pool of people.