The Collaborative International Dictionary of English v.0.48:

Uproar \Up"roar\ ([u^]p"r[=o]r`), n. [D. oproer; akin to G.
   aufruhr, Dan. opr["o]r, Sw. uppror; D. op up + roeren to
   stir; akin to AS. hr[=e]ran to stir, hr[=o]r stirring,
   active, G. r["u]hren to stir, OHG. ruoren, Icel. hr[ae]ra,
   Dan. r["o]re, Sw. r["o]ra. Cf. Rearmouse.]

   Note: [In verse, sometimes accented on the second syllable.]
   Great tumult; violent disturbance and noise; noisy confusion;
   bustle and clamor.
   [1913 Webster]

         But the Jews which believed not, . . . set all the city
         on an uproar.                            --Acts xvii.
                                                  5.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Uproar \Up*roar"\, v. t.
   To throw into uproar or confusion. [Obs.] "Uproar the
   universal peace." --Shak.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Uproar \Up*roar"\, v. i.
   To make an uproar. [R.] --Carlyle.
   [1913 Webster]

WordNet (r) 3.0 (2006):

uproar
    n 1: a state of commotion and noise and confusion [syn:
         tumult, tumultuousness, uproar, garboil]
    2: loud confused noise from many sources [syn: hubbub,
       uproar, brouhaha, katzenjammer]

Moby Thesaurus II by Grady Ward, 1.0:

118 Moby Thesaurus words for "uproar":
   Bedlam let loose, ado, affray, agitation, babel, bedlam, blast,
   bluster, bobbery, bother, brawl, broil, brouhaha, bustle,
   cacophony, chaos, charivari, chirm, clamor, clangor, clap, clatter,
   coil, commotion, confusion, din, discord, disorder, disturbance,
   donnybrook, donnybrook fair, drunken brawl, dustup, ebullience,
   ebullition, eddy, effervescence, embroilment, fanaticism,
   feery-fary, ferment, fermentation, flap, flurry, fomentation,
   foofaraw, fracas, free-for-all, frenzy, fume, furor, furore, fury,
   fuss, gaff, hassle, hell broke loose, helter-skelter, howl, hubbub,
   hue and cry, hullabaloo, hurly-burly, hurry, hurry-scurry, jangle,
   loud noise, melee, noise, noise and shouting, outburst, outcry,
   pandemonium, passion, pell-mell, perturbation, pother, racket,
   rage, rampage, rattle, rhubarb, riot, roar, rough-and-tumble,
   roughhouse, row, ruckus, ruction, ruffle, rumble, rumpus, scramble,
   shindig, shindy, shivaree, stir, storminess, swirl, swirling,
   tempestuousness, thunder, thunderclap, tintamarre, to-do, trouble,
   tumult, tumultuousness, turbulence, turmoil, upset, vociferation,
   vortex, whirl, wildness, yeastiness, zeal, zealousness