breakwater, groin, groyne, mole, bulwark, seawall, jetty
['ear, spike, capitulum', 'lumbermill, sawmill', 'joystick', 'king crab, Alaska crab, Alaskan king crab, Alaska king crab, Paralithodes camtschatica', 'parallel bars, bars', 'knee pad', 'rock crab, Cancer irroratus']