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observer

ob·serv·er

observer

 
pronunciation:
b zuhr vr
part of speech: noun
definition 1: someone who observes an event such as a meeting but does not participate in it.
synonyms:
onlooker, spectator
similar words:
auditor, bystander, examiner, inspector, looker-on, viewer, witness
definition 2: a military person who watches from an observation post or an airplane.
synonyms:
lookout
similar words:
guard, reconnoiterer, sentinel, spy, surveillant