A CATARACT is an 8-letter term for a large waterfall, usually characterized by a powerful rush of water and a loud roar. A CASCADE is a 7-letter term for a waterfall that descends in a series of steps or falls. A linn is a 4-letter term for a waterfall formed by a river flowing over a rocky ledge. A sunbow is a 6-letter term for a rainbow created by the MIST of a large waterfall. Finally, a MIST is a 4-letter term for the spray of water droplets created by a large waterfall.