n. 25B6; noun BETRAYER, back-stabber, double-crosser, double-dealer, renegade, Judas, quisling, fifth columnist; turncoat, defector, deserter; collaborator, informer, double agent; informal snake in the grass, two-timer.
TRAITOR
Meaning of TRAITOR in English
Concise Oxford thesaurus English vocabulary. Краткий оксфордский словарь английского языка тезаурус. 2012