breakwater, groin, groyne, mole, bulwark, seawall, jetty
['chime, bell, gong', 'safe', 'apiary, bee house', 'corkscrew, bottle screw', 'chain mail, ring mail, mail, chain armor, chain armour, ring armor, ring armour', 'ruddy turnstone, Arenaria interpres', 'submarine, pigboat, sub, U-boat']