breakwater, groin, groyne, mole, bulwark, seawall, jetty
['sidewinder, horned rattlesnake, Crotalus cerastes', 'breastplate, aegis, egis', 'crayfish, crawfish, crawdad, crawdaddy', 'submarine, pigboat, sub, U-boat', 'vacuum, vacuum cleaner', 'prison, prison house', 'water snake']