espial (n.)

• catching
• counterespionage
• counterintelligence
• detection
• determination
• disclosure
• discovery
• espionage
• excavation
• exhumation
• exposure
• find
• finding
• following
• intelligence
• invention
• locating
• location
• looking
• lookout
• note
• notice
• observance
• observation
• recognition
• rediscovery
• regard
• respect
• revelation
• serendipity
• shadowing
• spotting
• spying
• stakeout
• strike
• surveillance
• tailing
• trailing
• trove
• uncovering
• viewing
• watch
• watching
• wiretap