Synonyms of 'secret agent'
spyDictionary, undercover agent, spook (US , Canadian , informal)
He was blacklisted as a secret agent.
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spook (US , informal)
A spook is a spy.
a U.S. intelligence spook
A 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
A secret agent is a person who is employed by a government to find out the secrets of other governments.