Exact Match:
- spying
- the act of keeping a secret watch for intelligence purposes
- keeping a secret or furtive watch
Synonyms:
- bugging,
- cloak-and-dagger work,
- counterespionage,
- counterintelligence,
- detection,
- electronic surveillance,
- espial,
- espionage,
- following,
- intelligence,
- intelligence work,
- looking,
- lookout,
- military intelligence,
- note,
- notice,
- observance,
- observation,
- regard,
- respect,
- secret police,
- secret service,
- shadowing,
- stakeout,
- surveillance,
- tailing,
- trailing,
- viewing,
- watch,
- watching,
- wiretap,
- wiretapping,
- witnessing