coral reef
['great white shark, white shark, man-eater, man-eating shark, Carcharodon carcharias', 'chambered nautilus, pearly nautilus, nautilus', 'coil, spiral, volute, whorl, helix', 'cauliflower', 'hermit crab', 'American egret, great white heron, Egretta albus', 'swab, swob, mop']