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