| Meaning | A person secretly employed in espionage for a government. |
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| Synonyms | intelligence officer, intelligence agent, operative |
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| Narrower | NOC | An undercover agent who is given no official cover |
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| agent-in-place | An operative serving as a penetration into an intelligence target |
| agent provocateur, provocateur | A secret agent who incites / incites suspected persons to commit illegal acts |
| bridge agent | An operative who acts as a courier or go-between from a case officer to a secret agent in a hostile area |
| case officer | An operative who also serves as an official staffer of an intelligence service |
| codetalker, windtalker | A secret agent who was one of the Navajos who devised and used a code based on their native language |
| foot | A member of a surveillance team who works on foot or rides as a passenger |
| spy, undercover agent | (military) a secret agent hired by a state to obtain information about its enemies or by a business to obtain industrial secrets from competitors |
| walk-in | An operative who initiates his own defection (usually to a hostile country) for political asylum |
| Broader | agent | A representative who acts on behalf of other persons or organizations |
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| Spanish | agente de inteligencia, agente operativo, agente secreto |
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| Catalan | agent d'intel·ligència, agent operatiu, agent secret |
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