2
secret agent
2
witness
2
investigate
2
monitor
2
spectator
2
viewer
1
intelligence officer
1
activity
1
informer
1
inquire
1
person(noun, adjective)
1
rat(feature, person, information, individual, squealer)
1
snoop
1
stool pigeon
1
supervise
1
watcher
0
intelligence agent
0
survey
0
view(noun, verb)
0
wiretap
<12>
10 years ago|230 views|share |citing 
APASmart Define. (2016). spy thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/spy/thesaurus/broader
ChicagoSmart Define. 2016. "spy thesaurus" https://smartdefine.org/spy/thesaurus/broader (accessed September 21, 2026).
HarvardSmart Define 2016, spy thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/spy/thesaurus/broader>.
MLASmart Define. "spy thesaurus" 10 February 2016. Web. 21 September 2026. <https://smartdefine.org/spy/thesaurus/broader>