The Collaborative International Dictionary of English v.0.48:

Fracas \Fra"cas\ (fr[=a]"kas; F. fr[.a]`k[aum]"; 277), n. [F.,
   crash, din, tumult, It. fracasso, fr. fracassare to break in
   pieces, perh. fr. fra within, among (L. infra) + cassare to
   annul, cashier. Cf. Cashier, v. t.]
   An uproar; a noisy quarrel; a disturbance; a brawl.
   [1913 Webster]

WordNet (r) 3.0 (2006):

fracas
    n 1: noisy quarrel [syn: affray, altercation, fracas]

Moby Thesaurus II by Grady Ward, 1.0:

108 Moby Thesaurus words for "fracas":
   Bedlam let loose, ado, affray, altercation, argument, barney,
   bedlam, bicker, bickering, blast, blood feud, bobbery, bother,
   brannigan, brawl, broil, brouhaha, charivari, chirm, clamor,
   clangor, clap, clatter, commotion, contention, controversy, din,
   disagreement, discord, disorder, dispute, disturbance, donnybrook,
   donnybrook fair, drunken brawl, dustup, embroilment, feud, fight,
   flap, fliting, foofaraw, fray, free-for-all, fuss, hassle,
   hell broke loose, helter-skelter, howl, hubbub, hue and cry,
   hullabaloo, imbroglio, jangle, knock-down-and-drag-out, logomachy,
   loud noise, melee, noise, noise and shouting, open quarrel, outcry,
   pandemonium, pell-mell, polemic, pother, quarrel, racket, rampage,
   rattle, rhubarb, riot, roar, rough-and-tumble, roughhouse, row,
   ruckus, ruction, rumble, rumpus, run-in, scramble, scrap,
   scrimmage, scuffle, set-to, sharp words, shindy, shivaree,
   slanging match, snarl, spat, squabble, stir, strife, thunder,
   thunderclap, tiff, tintamarre, to-do, trouble, tumult, turmoil,
   tussle, uproar, vendetta, words, wrangle