watcher

1 a person or group that watches over someone or something <the inexperienced babysitter turned out to be a well-meaning but hopelessly incompetent watcher of young children> Synonyms custodian, guardian, keeper, lookout, minder, picket, sentinel, sentry, warden, warder, watch, guard, watchmanRelated Words observer, patrol, spotter, surveillant, watchdog; bodyguard, convoy, defender, escort, honor guard; gatekeeper; hack [slang]

2 someone who sees or watches something <a safari that affords wildlife watchers plenty of opportunities to see Africa's grandest creatures in their natural habitat> Synonyms bystander, observer, onlooker, viewer, spectatorRelated Words eyewitness, witness; peeper, spy, voyeur