secret agent

Từ điển WordNet v3.1 - WordNet Dictionary

noun

a person secretly employed in espionage for a government
• Syn:
intelligence officer, intelligence agent, operative
• Hypernyms:
agent
• Hyponyms:
agent-in-place, agent provocateur, provocateur, bridge agent, case officer,
case officer, windtalker, foot, NOC, spy,
undercover agent, walk-in