Waterfall
Part of speech: verb
Definition: To fall like a waterfall.
Part of speech: noun
Definition: A flow of water over the edge of a cliff. A waterfall-like outpouring of liquid, smoke, etc.
Cataract
Part of speech: noun
Definition: A waterspoutA large waterfall; steep rapids in a river.A downpour, flood of waterA disease of the eye causing its opacity and, unless treated, leading to blindness.