spotter

n.

1.

One who spots.

Noun	1.	spotter - a worker employed at a dry-cleaning establishment to remove spots
	2.	spotter - a worker employed to apply spots (as markers or identifiers)
	3.	spotter - a person employed to watch for something to happen Synonyms: lookout, lookout man, picket, scout, sentinel, sentry, watch
	4.	spotter - someone who is the first to observe something Synonyms: discoverer, finder

Argus, CIA man, Charley, airplane spotter, beagle, cloak-and-dagger operative, counterintelligence agent, counterspy, dick, double agent, espionage agent, eye, fire patrolman, fire warden, fireguard, flatfoot, forward observer, gumshoe, gumshoe man, hawkshaw, inside man, intelligence agent, lookout, lookout man, military-intelligence man, naval-intelligence man, night watchman, operative, patrol, patroller, patrolman, picket, private eye, reconnoiterer, roundsman, scout, secret agent, sentinel, sentry, skip tracer, sleuthhound, spy, spy-catcher, tec, undercover man, vedette, watch, watcher, watchkeeper, watchman