Espionage, Espionagist And Espionagry Are All Acts In Simple Definition - The Practice Of Spying Or Of Using Spies, Typically By Governments To Obtain Political And Military Information. … Other Attributive Synonyms Are: Undercover Work, Cloak-And- Dagger Activities, Surveillance, Reconnaissance, Intelligence, Eavesdropping, Infiltration, Cyberespionage, Counter-Espionage, Counter-Intelligence.