Which word names both a large waterfall and a clouding of the eye's lens?

What is the water-filled barrier around a castle called? Which word names both a water spirit of German folklore and to put a stop to something? A water tower in Stanton, Iowa, a town of Swedish heritage, is painted to look like a giant what? The waterfall with the longest uninterrupted drop in the world, 3,212 feet, is on which continent? What is a watery mix of kitchen scraps fed to hogs called? A censored joke about a "W.C." (water closet) led which host to walk off his show on February 11, 1960? In some Arthurian tales, which sword did young Arthur pull from a stone? In which 1984 film does a weary Daniel LaRusso hear "Get him a body bag" before winning with a crane kick?