Watcher

n.

1.

One who watches; one who sits up or continues; a diligent observer; specifically, one who attends upon the sick during the night.

Noun	1.	watcher - a close observer; someone who looks at something (such as an exhibition of some kind); "the spectators applauded the performance"; "television viewers"; "sky watchers discovered a new star" Synonyms: looker, spectator, viewer, witness
	2.	watcher - a guard who keeps watch Synonyms: security guard, watchman
	3.	watcher - a person who keeps a devotional vigil by a sick bed or by a dead body

Argus, Charley, TV-viewer, airplane spotter, beholder, bird-watcher, bystander, drugstore cowboy, eyewitness, fire patrolman, fire warden, fireguard, forward observer, gaper, gazer, gazer-on, girl-watcher, goggler, kibitzer, looker, looker-on, lookout, lookout man, night watchman, observer, ogler, onlooker, patrol, patroller, patrolman, perceiver, percipient, picket, roundsman, scout, seer, sentinel, sentry, sidewalk superintendent, spectator, spectatress, spectatrix, spotter, televiewer, television-viewer, vedette, video-gazer, viewer, watch, watchkeeper, watchman, witness