Betrayer
131conspirator — I (Roget s IV) n. Syn. betrayer, schemer, cabalist, confederate; see associate , traitor . II (Roget s 3 Superthesaurus) n. schemer, plotter, accomplice, engineer, collaborator, colluder, *wire puller, subversive, traitor, *backstabber, betrayer …
132traitoress — n. female traitor, female betrayer trai·tor || treɪtÉ™(r) n. betrayer, one who betrays another or his country, one who commits treason …