Synonyms to barrier

abatis, advanced work, balistraria, bank, banquette, barbed-wire entanglement, barbican, barricade, bartizan, bastion, battlement, breastwork, bulwark, casemate, cheval-de-frise, circumvallation, contravallation, counterscarp, curtain, demibastion, dike, drawbridge, earthwork, enclosure, entanglement, escarp, escarpment, fence, fieldwork, fortalice, fortification, glacis, loophole, lunette, machicolation, mantelet, merlon, mound, outwork, palisade, parados, parapet, portcullis, postern gate, rampart, ravelin, redan, redoubt, sally port, scarp, sconce, stockade, tenaille, vallation, vallum, work, gorge, abysm, abyss, allay, arroyo, bar, batten, blank wall, blind alley, blind gut, block, blockade, blockage, bolt, bolt down, bottleneck, box canyon, breach, break, canyon, cavity, cecum, chap, chasm, check, chimney, chink, choke, choking, choking off, cleft, cleuch, clog, clough, clove, cloy, col, congest, congestion, constipation, costiveness, coulee, couloir, crack, cram, cranny, crevasse, crevice, crowd, cul-de-sac, cut, cwm, dead end, defile, dell, devour, ditch, donga, draw, drench, embolism, embolus, en