Synonyms for spy

Noun

1. spy, undercover agent, secret agent, intelligence officer, intelligence agent, operative

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

2. spy, spectator, witness, viewer, watcher, looker

usage: a secret watcher; someone who secretly watches other people; "my spies tell me that you had a good time last night"

Verb

1. descry, spot, espy, spy, sight

usage: catch sight of

2. spy, stag, snoop, sleuth, monitor, supervise, ride herd on

usage: watch, observe, or inquire secretly

3. spy, investigate, inquire, enquire

usage: secretly collect sensitive or classified information; engage in espionage; "spy for the Russians"