1
private investigator
1
ranger
1
recognizer
1
roomer
1
roundsman
1
scanner(noun, search, device, detect, sensor)
1
scorer
1
secret service(noun, expression, plant, agent, operative)
1
security guard
1
security officer
1
sensing system(noun, search, device, detect, sensor)
1
sensor(noun, search, device, detect)
1
shamus
1
signaller
1
sleeper(noun, plant, agent, spy, operative)
1
sleuth(noun, plant, watch, guard, agent)
1
slipper
1
smudger
1
snatcher
1
sniffer(noun, search, device, detect, sensor)
11 years ago|7.3k views|share |citing 
APASmart Define. (2015). spotter thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/spotter/thesaurus/synonyms
ChicagoSmart Define. 2015. "spotter thesaurus" https://smartdefine.org/spotter/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, spotter thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/spotter/thesaurus/synonyms>.
MLASmart Define. "spotter thesaurus" 14 April 2015. Web. 25 September 2026. <https://smartdefine.org/spotter/thesaurus/synonyms>