boon, zero sum, differentiator, saver, godsend, savior, lynchpin, catalyst, linchpin, paradigm shift, panacea, lifesaver, harbinger, precursor, litmus test, breaker, enabler, factor, breakthrough, transformational, trump card, silver bullet, holy grail, slam dunk, keystone, disrupter, death knell, stepping stone, timesaver, ramification, trendsetter, microcosm, brainer, nonevent, kingmaker, saving grace, masterstroke, battleground, milestone, groundbreaker, centerpiece, difference, determinant, cripple, gotcha, tradeoff, stumbling block, analyser, cornerstone, facet, magic bullet, focal point, workhorse, motivator, crown jewel, showstopper, implications, heralds, stealer, dud, prelude, buster, makings, moneymaker, ailes, flashpoint, shocker, heck, paradigm, backer, quantum leap, impediment, vaporware, morale booster, deathblow, drawback, helluva, impact, component, latecomer, foregone conclusion, supercharge, platform, silver lining, biggie, launching pad, hub, fait accompli, tool, backfire, mii, offing, dynamic, steppingstone, unifier, energizer, jumpstart, spark, spur, overkill, deterrent, rainmaker, changers, machine, generator, recorder, switchboard, blower, drier, dryer, lathe, machines, mixer, welder, blender, hoist, projector, pump, switch, commutator, contactor, flop, relay, valve, pneumatic, rectifier, start, thermostatic, actuated, amplifier, compressor, electropneumatic, gear, overdrive, reset, battery, button, lever, reversing, servo

adulterator

phonograph, record player

mechanical device

auto-changer, record changer