T square, aegis, annul, antacid, antidote, arch dam, arm guard, awl, backstop, bale breaker, bamboo curtain, bank, bar, barrage, barrier, battering ram, bear-trap dam, beaver dam, bevel, bevel square, bodkin, boom, bradawl, brattice, breakwater, breastwork, brick wall, bring to nothing, buff, buffer
state, bulkhead, bulwark, bumper, calender, calipers, cancel, cancel out, cant hook, caulking iron, center punch, chamois, cloison, cofferdam, collision mat, come to nothing, contraceptive, copyright, counteractant, counteractive, counteragent, counterbalance, counterirritant, crash helmet, crowbar, cushion, dam, dashboard, defense, diaphragm, dibble, dike, dissepiment, ditch, dividers, dividing line, dividing wall, division, dodger, drag, earthwork, edger, electric sander, electric soldering iron, embankment, face mask, fence, fender, file, finger guard, flail, foot guard, forceps, fork, frustrate, fuse, gate, glazer, goggles, goose, governor, grader, grapnel, grappling iron, gravity dam, grease gun, grindstone, groin, guard, guardrail, hand guard, handrail, hard hat, harrow, hawk, helmet, hook, hydraulic-fill dam, insulation, interlock, interseptum, invalidate, iron, iron curtain, jack, jackscrew, jam, jetty, jointer, knee guard, knuckle guard, laminated glass, lathe, leaping weir, levee, level, life preserver, lifeline, lightning conductor, lightning rod, logjam, mangle, mask, mat, midriff, midsection, milldam, miter box, moat, mole, mound, mudguard, nail file, nail puller, negate, negativate, negative, neutralize, neutralizer, nose guard, nullifier, nullify, offset, pad, padding, palette knife, palladium, panel, parapet, paries, partition, party wall, patent, peavey, pilot, pincers, pinch bar, pitchfork, plane, planer, pliers, polisher, portcullis, press, preventative, preventive, property line, prophylactic, protective clothing, protective umbrella, puller, punch, punch pliers, puncheon, putty knife, ram, rammer, rampart, ramrod, remedy, ripping bar, roadblock, rock-fill dam, roller, rolling pin, safeguard, safety, safety glass, safety plug, safety rail, safety shoes, safety switch, safety valve, sander, screen, screwdriver, seat belt, seawall, separation, septulum, septum, shaper, shield, shin guard, shock pad, shutter dam, soldering iron, spatula, square, stapler, steamroller, stone wall, stultify, sun helmet, tackle, tamp, tamper, tamping pick, tap, thwart, tire iron, tire tool, tongs, trowel, tweezers, umbrella, undo, vise, vitiate, void, wall, weir, wicket dam, windscreen, windshield, work, wrecking bar, wringer
hindrance, prevention, preclusion, obstruction, stoppage, embolus, embolism, infarct, interruption, interception, interclusion, hindrance, impedition, retardment, retardation, embarrassment, oppilation, coarctation, stricture, restriction, restraint, inhibition, blockade, interference, interposition, obtrusion, discouragement, discountenance, impediment, let, obstacle, obstruction, knot, knag, check, hitch, contretemps, screw loose, grit in the oil, bar, stile, barrier, turnstile, turnpike, gate, portcullis, beaver dam, trocha, barricade, wall, dead wall, sea wall, levee breakwater, groyne, bulkhead, block, buffer
, stopper, boom, dam, weir, burrock, drawback, objection, stumbling-block, stumbling-stone, lion in the path, snag, snags and sawyers, encumbrance, incumbrance, clog, skid, shoe, spoke, drag, drag chain, drag weight, stay, stop, preventive, prophylactic, load, burden, fardel, onus, millstone round one's neck, impedimenta, dead weight, lumber, pack, nightmare, Ephialtes, incubus, old man of the sea, remora, difficulty, insuperable, obstacle, estoppel, ill wind, head wind, trammel, tether, hold back, counterpoise, damper, wet blanket, hinderer, marplot, killjoy, party pooper, party crasher, interloper, trail of a red herring, opponent, hindering, obstructive, obstruent, impeditive, impedient, intercipient, prophylactic, impedimentary, in the way of, unfavorable, onerous, burdensome, cumbrous, cumbersome, obtrusive, hindered, windbound, waterlogged, heavy laden, hard pressed, unassisted &c (assist), single-handed, alone, deserted, occurrent nubes.
defense, protection, guard, ward, shielding, propugnation, preservation, guardianship, area defense, site defense, self-defense, self-preservation, resistance, safeguard, balistraria, bunker, screen, camouflage, fortification, munition, muniment, trench, foxhole, bulwark, fosse, moat, ditch, entrenchment, intrenchment, kila, dike, dyke, parapet, sunk fence, embankment, mound, mole, bank, sandbag, revetment, earth work, field- work, fence, wall dead wall, contravallation, paling, palisade, haha, stockade, stoccado, laager, sangar, barrier, barricade, boom, portcullis, chevaux de frise, abatis, abattis, abbatis, vallum, circumvallation, battlement, rampart, scarp, escarp, counter-scarp, glacis, casemate, vallation, vanfos, buttress, abutment, shore, breastwork, banquette, curtain, mantlet, bastion, redan, ravelin, vauntmure, advance work, horn work, outwork, barbacan, barbican, redoubt, fort-elage, fort-alice, lines, loophole, machicolation, sally port, hold, stronghold, fastness, asylum, keep, donjon, dungeon, fortress, citadel, capitol, castle, tower of strength, tower of strength, fort, barracoon, pah, sconce, martello tower, peelhouse, blockhouse, rath, wooden walls, bulletproof vest, armored vest, buffer
, corner stone, fender, apron, mask, gauntlet, thimble, carapace, armor, shield, buckler, aegis, breastplate, backplate, cowcatcher, face guard, scutum, cuirass, habergeon, mail, coat of mail, brigandine, hauberk, lorication, helmet, helm, bassinet, salade, heaume, morion, murrion, armet, cabaset, vizor, casquetel, siege cap, headpiece, casque, pickelhaube, vambrace, shako, bearskin, panoply, truncheon, garrison, picket, piquet, defender, protector, guardian, bodyguard, champion, knight-errant, Paladin, propugner, bulletproof window, hardened site, defending, defensive, mural, armed, armed at all points, armed cap-a-pie, armed to the teeth, panoplied, iron-plated, ironclad, loopholed, castellated, machicolated, casemated, defended, proof against, armored, ballproof, bulletproof, hardened, defensively, on the defense, on the defensive, in defense, at bay, pro aris et focis, Int, no surrender!, defense not defiance, Dieu defend le droit, fidei defensor, defender of the faith.