Synonyms of observer
1 witnessDictionary • A casual observer would have assumed they were lovers.
witness • No witnesses of the crash have come forward.
viewer • The series is watched by around 19 million viewers every week.
spectator • Thirty thousand spectators watched the final game.
watcher • A perceptive watcher would have realised something was wrong.
onlooker • A handful of onlookers stood around watching.
eyewitness • Eyewitnesses say the police opened fire on the crowd.
bystander • It looks like an innocent bystander was killed instead of you.
fly on the wall
2 commentatorDictionary • Political observers believe there may be a general election soon.
commentator • a sports commentator
3 monitorDictionary • A UN observer should attend the conference.
monitor • Government monitors will continue to accompany reporters.
inspector • The mill was finally closed down by safety inspectors.
watchdog • the government's consumer watchdog, the Office of Fair Trading
supervisor • a full-time job as a supervisor at a factory
overseer • Officials agreed to appoint a federal overseer to run the agency's daily business.
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bystanderA bystander is a person who is present when something happens and who sees it but does not take part in it.
• It looks like an innocent bystander was killed instead of you.
commentatorA commentator is a broadcaster who gives a radio or television commentary on an event.
• a sports commentator
eyewitnessAn eyewitness is a person who was present at an event and can therefore describe it, for example in a law court.
• Eyewitnesses say the police opened fire on the crowd.
Thesaurus for observer from the Collins English Thesaurus
a person or thing that observes