Counterspy is a term used to describe a spy employed to counter or thwart the plans of another spy. It is sometimes difficult to find words that can substitute for counterspy because the term is quite precise. However, some synonyms can be used depending on the context of the situation. Some of these synonyms include double agent, mole, undercover agent, intelligence agent, infiltrator, spy catcher, and saboteur. A double-agent is someone who works undercover for two opposing sides. A mole is a secretive agent loyal to an enemy group. An undercover agent or intelligence agent works for the government and obtains secret information from foreign countries. Infiltrators are agents sent by an organization to gather intelligence by joining a rival group, while spy-catchers are agents who detect and capture foreign spies. Saboteurs are skilled agents that carry out acts of political disruption and sabotage.