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Synonyms for Lookout (same or very similar meaning)

WordNet sense 1 (a person employed to watch for something to happen):
picket, scout, sentinel, sentry, spotter, watch, lookout man

WordNet sense 2 (an elevated post affording a wide view):
observation post

WordNet sense 3 (a structure commanding a wide view of its surroundings):
observatory, lookout station, observation tower

WordNet sense 4 (the act of looking out):
outlook


From the ODE community, based on WordNetadd/edit