bulwark
noun
1. an embankment built around a space for defensive purposes
Similar word(s): rampart, wall
Definition categories: man–made, embankment
2. a fencelike structure around a deck (usually plural)
Definition categories: man–made, barrier
3. a protective structure of stone or concrete; extends from shore into the water to prevent a beach from washing away
Similar word(s): breakwater, groin, groyne, jetty, mole, seawall
Definition categories: man–made, barrier