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