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Related to treasonist: traitor, treasonous
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|Noun||1.||treasonist - someone who betrays his country by committing treason|
criminal, crook, felon, malefactor, outlaw - someone who has committed a crime or has been legally convicted of a crime
fifth columnist, saboteur - a member of a clandestine subversive organization who tries to help a potential invader
traitress - female traitor