Synonyms of secret agent
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spook (US, informal)A spook is a spy.
• a U.S. intelligence spook
spysecret agentdouble agentsecret service agentundercover agentmoleforeign agentfifth columnistnark (British, Australian, New Zealand, slang)
spyA spy is a person whose job is to find out secret information about another country or organization.
• He was jailed for five years as an alleged British spy.
Thesaurus for secret agent from the Collins English Thesaurus