The Collaborative International Dictionary of English v.0.48:

brouhaha \brouhaha\ n.
   1. the confused noise of many voices.

   Syn: hubbub, uproar.
        [WordNet 1.5]

   2. a confused disturbance far greater than its cause merits.
      [WordNet 1.5]

WordNet (r) 3.0 (2006):

brouhaha
    n 1: loud confused noise from many sources [syn: hubbub,
         uproar, brouhaha, katzenjammer]
    2: a confused disturbance far greater than its cause merits

Moby Thesaurus II by Grady Ward, 1.0:

148 Moby Thesaurus words for "brouhaha":
   Bedlam let loose, ado, agitation, babel, bedlam, blast, bluster,
   bobbery, boil, boiling, bother, brawl, broil, bustle, cacophony,
   chaos, charivari, chirm, churn, clamor, clangor, clap, clatter,
   coil, commotion, conturbation, din, discomposure, discord,
   disorder, disquiet, disquietude, disturbance, donnybrook,
   donnybrook fair, drunken brawl, dustup, ebullience, ebullition,
   eddy, effervescence, embroilment, excitement, fanaticism,
   feery-fary, ferment, fermentation, fever, feverishness, fidgets,
   flap, flurry, fluster, flutteration, foment, fomentation, foofaraw,
   fracas, free-for-all, frenzy, fume, furor, furore, fury, fuss,
   hassle, hell broke loose, helter-skelter, howl, hubbub,
   hue and cry, hullabaloo, hurly-burly, hurrah, hurry, hurry-scurry,
   inquietude, jangle, jitters, jumpiness, loud noise, maelstrom,
   malaise, melee, moil, nerviness, nervosity, nervousness, noise,
   noise and shouting, outcry, pandemonium, passion, pell-mell,
   perturbation, pother, racket, rage, rampage, rattle, restlessness,
   rhubarb, riot, roar, roil, rough-and-tumble, roughhouse, rout, row,
   ruckus, ruction, ruffle, rumble, rumpus, scramble, seethe,
   seething, shindy, shivaree, stir, storminess, swirl, swirling,
   tempestuousness, thunder, thunderclap, tintamarre, to-do,
   trepidation, trepidity, trouble, tumult, tumultuation,
   tumultuousness, turbidity, turbulence, turmoil, twitter, unease,
   unrest, uproar, upset, vortex, whirl, wildness, yeastiness, zeal,
   zealousness