conspirator

from WordNet (r) 3.0 (2006)

conspirator
    n 1: a member of a conspiracy [syn: {conspirator},
         {coconspirator}, {plotter}, {machinator}]

from The Collaborative International Dictionary of English v.0.48

Conspirator \Con*spir"a*tor\, n.
   One who engages in a conspiracy; a plotter. --2 Sam. xv. 31.
   [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

40 Moby Thesaurus words for "conspirator":
      Benedict Arnold, Brutus, Judas, Judas Iscariot, Machiavellian,
      Quisling, abettor, accessory, accomplice, archtraitor, betrayer,
      cockatrice, coconspirator, conniver, conspirer, counterplotter,
      double agent, double-crosser, double-dealer, exploiter, finagler,
      informer, intrigant, intriguer, machinator, maneuverer, operator,
      opportunist, plotter, quisling, rat, schemer, serpent, snake,
      timeserver, traitor, treasonist, trimmer, turncoat, wire-puller