mole

mole

noun

Definition of MOLE

a person who tries secretly to obtain information for one country in the territory of another usually unfriendly country <for years we have had a mole in the enemy's national intelligence agency>

Synonyms agent, asset, emissary, intelligencer, mole, operative, spook, undercover

Related Words courier; counterspy, double agent, sleeper; infiltrator, informer, stool pigeon; spymaster, superspy