watcher

Noun
  1. A close observer;
    Someone who looks at something (such as an exhibition of some kind) (synset 110652848)
    "the spectators applauded the performance"; "television viewers"; "sky watchers discovered a new star"
  2. A guard who keeps watch (synset 110789727)
  3. A person who keeps a devotional vigil by a sick bed or by a dead body (synset 110789450)

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