Charybdis, Maelstrom, ado, agitation, back, back stream, backflow, backwash, backwater, brouhaha, bustle, centrifugate, centrifuge, commotion, countercurrent, counterflow, counterflux, cyclone, disturbance, dizzy round, dust devil, ebullience, ebullition, effervescence, embroilment, feery-fary, ferment, fermentation, flurry, fume, gulf, gurge, gyre, hurly-burly, hurricane, hurry, hurry-scurry, maelstrom, pell-mell, perturbation, pirouette, purl, rat race, reel, refluence, reflux, regurgitation, round, ruffle, spin, stir, surge, swirl, swirling, to-do, tornado, tumult, turbulence, turmoil, turn, twirl, twister, typhoon, uproar, vortex, waterspout, wheel, whirl, whirligig, whirlpool, whirlwind, whorl, yeastiness