One that watches or observes:
A person who sees or has seen something happen, as an accident, crime, etc.
The definition of a spectator is a person who watches or observes.
A person who attends an assembly, convention, etc., not as an official delegate but only to observe and report the proceedings
A spectator; an onlooker.
The definition of a witness is a person who has seen an event or who testifies about what he has seen.
A person who participates or shares in something
Find another word for bystander. In this page you can discover 21 synonyms, antonyms, idiomatic expressions, and related words for bystander, like: watcher, eyewitness, spectator, observer, passerby, participant, adjoiner, earwitness, girl-watcher, goggler and neighborer.