spy Synonyms

agent eavesdropper sight snoop espy stool pigeon secret agent stag double agent informer mole sleuth operative descry spot narc bird dog insider double-crosser stoolie snitcher lay eyes on cast around intelligence agent intelligence officer stalker supranaturalistic tail traducer traitor turncoat view watch watcher fink make out listen in wiretap set eyes on shoofly sleuthing snooper spycatcher stakeout surveil sneak a look intelligence operative inside man secret service plainclothesman