Observer - Onlooker - Passer-by - Bystander - Eyewitness
These are all words for a person who sees sth happen.
Witness a person who sees sth happen and is able to describe it to other people; a person who gives evidence in a court of law: Police have appealed for witnesses to the accident.
Observer a person who sees sth happen: According to observers, the plane exploded shortly after take-off.
Onlooker a person who watches sth that is happening but is not involved in it: A crowd of onlookers gathered at the scene of the crash.
Passer-by a person who is going past sb/sth by chance, especially when sth unexpected happens: Police asked passers-by if they had witnessed the accident.
Bystander a person who is near and can see what is happening when sth such as an accident or fight takes place: Three innocent bystanders were killed in the crossfire.
Eyewitness a person who has seen a crime or accident and can describe it afterwards.
PATTERNS
*a(n) witness/observer/onlooker/passer-by/bystander/ an eyewitness sees sth
*a(n) observer/onlooker/passer-by/bystander witnesses sth
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Top Tips Abz Ingles - Notes on usage - Synonyms
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