Whirlpool (noun)

1. A body of swirling water, especially one in a river or sea caused by the meeting of conflicting currents.
2. A rapidly rotating mass of water in a bathtub or other receptacle, typically caused by the inflow of a drain.

Origin:

From the old english word "hwyrfl" meaning "whirl" or "whirlwind" and the suffix "-pool" meaning "a body of water".

Examples:

1. The boat was caught in a whirlpool and started to spin.
2. The whirlpool in the river was caused by the convergence of two currents.
3. The whirlpool in the bathtub was caused by the drain.
4. The river was full of dangerous whirlpools.
5. The swimmers were warned to stay away from the whirlpools.