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Definition of sentry:

  1. A soldier placed on guard; a sentinel.
  2. Guard; watch, as by a sentinel.

Synonyms:

vigil, pathfinder, observatory, guard, pale, cannon fodder, observation post, bombardier, grenadier, guard, Green Beret, protector, airman, spotter, airwoman, commando, lookout station, guide, piquet, safety, ward, talent scout, awareness, sentinel, crew, watch, lookout, lookout man, picket, outlook, foot soldier, scout, protector, GI, finder, observation tower, ticker, discoverer.

Usage examples: