| spy(noun, person, plant, spy, operative) |
| secret agent(noun, expression, plant, agent, spy) |
| betrayer(noun, spy, turncoat, conspirator) |
| counterspy(noun, spy) |
| espionage agent(noun, expression, plant, agent, spy) |
| informer(noun, plant, agent, spy, operative) |
| intelligence agent |
| mole(noun, plant, agent, spy, operative) |
| observer(noun, plant, agent, operative, informer) |
| traitor(noun, spy, turncoat, conspirator) |
| turncoat(noun, spy, traitor, conspirator) |
| Benedict Arnold(noun, expression, spy, turncoat, traitor) |
| double-crosser(spy, turncoat, conspirator) |
| intriguer(spy, turncoat, conspirator) |
| operative(noun, plant, agent, spy, mole) |
| plant(noun, agent, spy, operative, informer) |
| quisling(spy, turncoat, conspirator) |
| reconnoiterer |
| scout(noun, plant, agent, spy, operative) |
| snake(spy, turncoat, conspirator) |