emissary

1 a person sent on a mission to represent another <most of the industrialized nations of the world sent emissaries to the conference on global warming> Synonyms agent, delegate, ambassador, envoy, legate, minister, representativeRelated Words ambassadress; attaché, chargé d'affaires, consul, deputy, diplomat, foreign minister, nuncio, procurator, proxy; apostle, evangelist, missionary; deputation, detachment, legation; courier, messenger; mouthpiece, spokesperson

2 a person who tries secretly to obtain information for one country in the territory of another usually unfriendly country <the embassy's staff likely contains at least one emissary who reports to the home country's chief of intelligence> Synonyms agent, asset, spy, intelligencer, mole, operative, spook, undercoverRelated Words courier; counterspy, double agent, sleeper; infiltrator, informer, stool pigeon; spymaster, superspy