THESAURUS
roadblock
arch dam, backstop, bamboo curtain, bank, bar, barrage, barricade, barrier, bear-trap dam, beaver dam, blank wall, block, blockade, boom, breakwater, breastwork, brick wall, buffer, bulkhead, bulwark, cofferdam, dam, defense, dike, ditch, earthwork, embankment, fence, gate, gravity dam, groin, hydraulic-fill dam, iron curtain, jam, jetty, leaping weir, levee, logjam, milldam, moat, mole, mound, parapet, portcullis, rampart, rock-fill dam, seawall, shutter dam, stone wall, stop, wall, weir, wicket dam, work