sentinel

English Thesaurus

1. a person employed to keep watch for some anticipated event (noun.person)

hypernym	:	security guard, watcher, watchman,
definition	:	a guard who keeps watch (noun.person)

derivation	:	look out, watch, watch out,
definition	:	be vigilant, be on the lookout or be careful (verb.perception)

derivation	:	descry, espy, spot, spy,
definition	:	catch sight of (verb.perception)

derivation	:	look out, watch, watch out,
definition	:	be vigilant, be on the lookout or be careful (verb.perception)

derivation	:	descry, espy, spot, spy,
definition	:	catch sight of (verb.perception)