protester

from WordNet (r) 3.0 (2006)
protester
    n 1: a person who dissents from some established policy [syn:
         {dissenter}, {dissident}, {protester}, {objector},
         {contestant}]
    2: someone who participates in a public display of group feeling
       [syn: {demonstrator}, {protester}]
from The Collaborative International Dictionary of English v.0.48
Protester \Pro*test"er\, n.
   1. One who protests; one who utters a solemn declaration.
      --Shak.
      [1913 Webster]

   2. (Law) One who protests a bill of exchange, or note.
      [1913 Webster]
from Moby Thesaurus II by Grady Ward, 1.0
36 Moby Thesaurus words for "protester":
      apostate, bitter-ender, brawler, defendant, demurrer, diehard,
      disputant, dissenter, dissentient, dissident, intransigent,
      irreconcilable, last-ditcher, litigant, naysayer, negativist,
      nonconformist, noncooperator, objector, obstructionist,
      obstructive, opinionist, opposer, opposition voice, oppositionist,
      plaintiff, protestant, quarreler, recusant, resister, schismatic,
      scrapper, sectarian, sectary, separatist, wrangler
antiflux / dictionary / protester
[email protected]