"watcher" in the noun sense
1. 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"
2. watchman, watcher, security guard
a guard who keeps watch
3. watcher
a person who keeps a devotional vigil by a sick bed or by a dead body
Source: WordNet® (An amazing lexical database of English)
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