waterspout

/W AO1 T ER0 S P AW0 T/
noun
  1. 1

    A whirlwind that forms over water, not associated with a mesocyclone of a thunderstorm (contrary to a true tornado).

  2. 2

    A true tornado that passes over a body of water.

  3. 3

    A channel through which water is discharged, especially from the gutters of a roof.

Source: https://en.wiktionary.org/wiki/waterspout