The Collaborative International Dictionary of English v.0.48:

Clamor \Clam"or\, v. i.
   To utter loud sounds or outcries; to vociferate; to talk in a
   loud voice; to complain; to make importunate demands.

   Syn: clamor, roar, vociferate, holler, hollo.
        [1913 Webster + WordNet 1.5]

              The obscure bird
              Clamored the livelong night.        --Shak.
        [1913 Webster]

   2. to dispute in a loud voice.

   Syn: brawl, wrangle, clamor.
        [WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

Clamor \Clam"or\, n. [OF. clamour, clamur, F. clameur, fr. L.
   clamor, fr. clamare to cry out. See Claim.]
   1. A great outcry or vociferation; loud and continued
      shouting or exclamation from many people. --Shak. [Also
      spelled clamour.]

   Syn: clamor, hue and cry.
        [1913 Webster + WordNet 1.5]

   2. Any loud and continued noise. --Addison.
      [1913 Webster]

   3. A continued expression of dissatisfaction or discontent; a
      popular outcry. --Macaulay.

   Syn: Outcry; exclamation; noise; uproar.
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Clamor \Clam"or\, v. t. [imp. & p. p. Clamored; p. pr. & vb.
   n. Clamoring.]
   1. To salute loudly. [R.]
      [1913 Webster]

            The people with a shout
            Rifted the air, clamoring their god with praise.
                                                  --Milton
      .
      [1913 Webster]

   2. To stun with noise. [R.] --Bacon.
      [1913 Webster]

   3. To utter loudly or repeatedly; to shout.
      [1913 Webster]

            Clamored their piteous prayer incessantly.
                                                  --Longfellow.
      [1913 Webster]

            To clamor bells, to repeat the strokes quickly so as
            to produce a loud clang.              --Bp.
                                                  Warbur?ion.
      [1913 Webster]

WordNet (r) 3.0 (2006):

clamor
    n 1: a loud harsh or strident noise [syn: blare, blaring,
         cacophony, clamor, din]
    2: loud and persistent outcry from many people; "he ignored the
       clamor of the crowd" [syn: clamor, clamoring, clamour,
       clamouring, hue and cry]
    v 1: make loud demands; "he clamored for justice and tolerance"
         [syn: clamor, clamour]
    2: utter or proclaim insistently and noisily; "The delegates
       clamored their disappointment" [syn: clamor, clamour]
    3: compel someone to do something by insistent clamoring; "They
       clamored the mayor into building a new park"

Moby Thesaurus II by Grady Ward, 1.0:

142 Moby Thesaurus words for "clamor":
   Babel, Bedlam let loose, adjuration, agitate, air a grievance,
   appeal, babel, bawl, be noisy, bedlam, beef, bellow, bellow out,
   bellyache, beseechment, bid, bitch, blast, bluster, bobbery, brawl,
   brouhaha, bustle, call, call out, charivari, chirm, claim, clangor,
   clap, clash, clatter, commotion, complain, convulsion, crab, croak,
   cry, cry out, debate, demand, din, discord, dispute, donnybrook,
   drunken brawl, dustup, entreaty, ferment, flap, fracas,
   free-for-all, fret, fret and fume, fuss, gaff, gripe, groan,
   grouch, grouse, growl, grumble, grunt, harshness, hassle,
   hell broke loose, holler, holler out, howl, hubbub, hue and cry,
   hullabaloo, hurly-burly, imploration, imploring, imprecation,
   invocation, invocatory plea, jangle, jar, kick, lodge a complaint,
   loud noise, maffick, make a noise, make a racket, make an outcry,
   make an uproar, mere noise, murmur, mutter, noise,
   noise and shouting, obsecration, obtestation, outcry, pandemonium,
   pipe up, plea, prayer, racket, raise Cain, raise a clamor,
   raise a howl, raise hell, raise the devil, raise the roof, rattle,
   register a complaint, rhubarb, roar, rogation, rout, row, ruckus,
   ruction, rumble, rumpus, shindy, shivaree, shout out, sing out,
   squawk, suit, supplication, take on, thunder, thunderclap,
   tintamarre, to-do, tumult, turmoil, upheaval, uproar, upturn,
   vociferate, vociferation, whirl, whoop it up, yap, yell out,
   yelp