Noun

• S: (n) spectator, witness, viewer, watcher, looker (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"
• S: (n) watchman, watcher, security guard (a guard who keeps watch)
• S: (n) watcher (a person who keeps a devotional vigil by a sick bed or by a dead body)