objector

from WordNet (r) 3.0 (2006)
objector
    n 1: a person who dissents from some established policy [syn:
         {dissenter}, {dissident}, {protester}, {objector},
         {contestant}]
from The Collaborative International Dictionary of English v.0.48
Objector \Ob*ject"or\, n. [L., an accuser.]
   One who objects; one who offers objections to a proposition
   or measure.
   [1913 Webster]
from Moby Thesaurus II by Grady Ward, 1.0
36 Moby Thesaurus words for "objector":
      apostate, bitter-ender, brawler, defendant, demurrer, diehard,
      disputant, dissenter, dissentient, dissident, intransigent,
      irreconcilable, last-ditcher, litigant, naysayer, negativist,
      nonconformist, noncooperator, obstructionist, obstructive,
      opinionist, opposer, opposition voice, oppositionist, plaintiff,
      protestant, protester, quarreler, recusant, resister, schismatic,
      scrapper, sectarian, sectary, separatist, wrangler
antiflux / dictionary / objector
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