rapids

noun rapids

• cataract — Cataracts are layers over a person's eyes that prevent them from seeing properly. Cataracts usually develop because of old age or illness.
• cascade — If you refer to a cascade of something, you mean that there is a large amount of it.
• chute — A chute is a steep, narrow slope down which people or things can slide.
• downrush — (intransitive) To rush down; rush downward.
• fall — to come or drop down suddenly to a lower position, especially to leave a standing or erect position suddenly, whether voluntarily or not: to fall on one's knees.