breakwater, groin, groyne, mole, bulwark, seawall, jetty
['sea cucumber, holothurian', 'loggerhead, loggerhead turtle, Caretta caretta', 'hammerhead, hammerhead shark', 'eel', 'reel', 'slide rule, slipstick', 'chiton, coat-of-mail shell, sea cradle, polyplacophore']