flatworm, platyhelminth
['coil, spiral, volute, whorl, helix', 'bobsled, bobsleigh, bob', 'sidewinder, horned rattlesnake, Crotalus cerastes', 'ocarina, sweet potato', 'hognose snake, puff adder, sand viper', 'green snake, grass snake', 'submarine, pigboat, sub, U-boat']