rampart, bulwark, wall -- (an embankment built around a space for defensive purposes; "they stormed the ramparts of the city"; "they blew the trumpet and the walls came tumbling down")
bulwark -- (a fencelike structure around a deck (usually plural))
breakwater, groin, groyne, mole, bulwark, seawall, jetty -- (a protective structure of stone or concrete; extends from shore into the water to prevent a beach from washing away)
(Sound)
