device vs knocker

Other hyponyms of device include acoustic device, adapter, adaptor, afterburner, agglomerator, aerofoil, airfoil, control surface, surface, alarm, alarm system, warning device, appliance, contraption, contrivance, convenience, gadget, gismo, gizmo, widget, applicator, applier, aspergill, aspersorium, automatic pilot, autopilot, robot pilot, bait, decoy, lure, billiard marker, bird feeder, birdfeeder, feeder, blower, bootjack, breathalyser, breathalyzer, breathing apparatus, breathing device, breathing machine, ventilator, bubbler, buffer, fender, catapult, launcher, battery charger, charger, clip-on, comb, baby's dummy, comforter, pacifier, teething ring, conductor, birth control device, contraceptive, contraceptive device, preventative, preventive, prophylactic device, converter, convertor, corer, corrective, restorative, crusher, cryptograph, cutoff, dampener, moistener, damper, muffler, deflector, dental appliance, depressor, detector, sensing element, sensor, diestock, drive, drop forge, drop hammer, drop press, elastic device, electrical device, electronic device, energiser, energizer, exercise device, explosive device, fan, filter, asphyxiator, extinguisher, fire extinguisher, flare, fumigator, gas fixture, groover, guard, safety, safety device, heater, warmer, heat exchanger, holding device, horn, foil, hydrofoil, imprint, indicator, instrument, ignition interlock, interlock, interrupter, jig, key, keyboard, Kinetoscope, doorknocker, rapper, lift, lifting device, igniter, ignitor, light, lighter, machine, magnet, mechanism, memory device, storage device, instrument, musical instrument, nest egg, noisemaker, optical device, override, paper feed, peeler, pick, plectron, plectrum, power takeoff, PTO, goad, prod, autocue, prompter, pull, reflector, button, release, remote, remote control, reset, constraint, restraint, router, runner, scratcher, shoehorn, shoetree, shooting stick, shredder, signaling device, snowshoe, sounder, source of illumination, stabiliser, stabilizer, stemmer, straightener, reinforcement, strengthener, stylus, suction cup, support, sweatbox, synchroflash, take-up, teaser, dart thrower, spear thrower, throwing board, throwing stick, tilter, pair of tongs, tongs, toy, trap, trigger, valve, vaporiser, vaporizer, ventilator, washboard, water cooler, slide chart, gun worm, carbonator, soda carbonator, soda maker, ultrasonic flaw detector, flocculator, microsensor, pulse oximeter, bottle capper, capping machine, seed sprouter, sprouter, vulcaniser, vulcanizer, positioner, speech synthesizer, microdevice, flow meter, network bridge, rotary encoder, shaft encoder, repulsor, repulsorlift, repulsorlift engine.