spy - noun

(military) a secret agent hired by a state to obtain information about its enemies or by a business to obtain industrial secrets from competitors

a secret watcher; someone who secretly watches other people

spy - verb

• catch sight of
• watch, observe, or inquire secretly
• catch sight of; to perceive with the eyes
• secretly collect sensitive or classified information; engage in espionage

spy - thesaurus

descry   espy   sight   sleuth   snoop   spot   stag