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