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OET→observer

observer

Flag: gbEnglishOxford English Thesaurus
observer
noun
spectator, onlooker, watcher, looker-on, fly on the wall, viewer, witness, eyewitness, bystander, sightseer;
commentator, reporter, blogger, monitor;
informal rubberneck;
literary beholder.
▷antonyms participant.
observer Oxford Dictionary of English
observer — OET · Shobdo