sentry

sentry

noun

Definition of SENTRY

a person or group that watches over someone or something <a sentry posted to watch for intruders>

Synonyms custodian, guardian, keeper, lookout, minder, picket, sentinel, sentry, warden, warder, watch, watcher, watchman

Related Words observer, patrol, spotter, surveillant, watchdog; bodyguard, convoy, defender, escort, honor guard; gatekeeper; hack [slang]