One who, or that which, drenches.
A fire prevention device, like a sprinkler but ejecting a denser curtain of water and sometimes mounted on the outside of a building to prevent the spread of fire from those nearby.
A large and generally unstoppable surge.
A very large and destructive wave, generally caused by a tremendous disturbance in the ocean, such as an undersea earthquake or volcanic eruption. Tsunami are usually a series of waves, or wave train.