Synonyms:
- Benedict Arnold,
- Brutus,
- Judas,
- Judas Iscariot,
- Judas-like,
- Quisling,
- Trojan-horse,
- Vicar of Bray,
- apostate,
- archtraitor,
- backslider,
- betrayer,
- betraying,
- bolter,
- cockatrice,
- collaborationist,
- collaborator,
- conniver,
- conspirator,
- conspirer,
- convert,
- defector,
- deserter,
- double agent,
- double-crosser,
- double-crossing,
- double-dealer,
- fifth columnist,
- fifth-column,
- informer,
- intrigant,
- intriguer,
- machinator,
- mugwump,
- plotter,
- proselyte,
- quisling,
- quislingistic,
- rat,
- recidivist,
- recreant,
- renegade,
- renegado,
- renegate,
- reversionist,
- runagate,
- schemer,
- schismatic,
- seceder,
- secessionist,
- separatist,
- serpent,
- snake,
- spy,
- straggler,
- strikebreaker,
- tergiversant,
- tergiversator,
- timeserver,
- traitor,
- traitorous,
- treasonable,
- treasonist,
- treasonous,
- trimmer,
- turnabout,
- turntail,
- two-timing