spy
I
noun
agent, detective, emissarius, explorator, informant, informer, intelligence agent, intelligencer, investigator, lookout, observer, reconnoiterer, reporter, scout, secret agent, sleuth, snoop, snooper, source, speculator, undercover agent, undercover man, watcher
associated concepts: espionage
II
verb
behold, catch sight of, descry, detect, discern, discover, discover by artifice, distinguish, eavesdrop, espy, examine secretely, explorare, follow, glimpse, inspect secretely, look at, look for, make a reconnaissance, make out, make secret observations, observe, peep, peer, perceive, pry, recognize, reconnoiter, scrutinize, search out, see, shadow, sight, snoop, speculari, spy upon, take note, trail, view, watch, watch secretely
III
index
conspirator, discern (detect with the senses), informant, observe (watch), recognize (perceive)
Burton's Legal Thesaurus.
William C. Burton.
2006