beholder, observer, perceiver - a person who becomes aware (of things or events) through the senses

browser - a viewer who looks around casually without seeking anything in particular

bystander - a nonparticipant spectator

cheerer - a spectator who shouts encouragement

eyewitness - a spectator who can describe what happened

motion-picture fan, moviegoer - someone who goes to see movies

ogler - a viewer who gives a flirtatious or lewd look at another person

looker-on, onlooker - someone who looks on

playgoer, theatergoer, theatregoer - someone who attends the theater

rubberneck - a person who stares inquisitively

spy - a secret watcher; someone who secretly watches other people; "my spies tell me that you had a good time last night"

starer - a viewer who gazes fixedly (often with hostility)

peeper, Peeping Tom, voyeur - a viewer who enjoys seeing the sex acts or sex organs of others

private security force, security force - a privately employed group hired to protect the security of a business or industry

bank guard - a security guard at a bank

fire watcher - (during World War II in Britain) someone whose duty was to watch for fires caused by bombs dropped from the air

guard - a person who keeps watch over something or someone

lookout, lookout man, picket, scout, sentinel, sentry, spotter, watch - a person employed to watch for something to happen

night watchman - a watchman who works during the night

patroller - someone on patrol duty; an individual or a member of a group that patrols an area

port watcher, portwatcher - a watchman on a wharf

human, individual, mortal, person, somebody, someone, soul - a human being; "there was too much for one person to do"