The definition of a witness is a person who has seen an event or who testifies about what he has seen.
The definition of a bystander is a person who stands near but doesn't take part in an event.
(Scientology) One trained to perform spiritual guidance procedures.
Find another word for hearer. In this page you can discover 9 synonyms, antonyms, idiomatic expressions, and related words for hearer, like: listener, witness, bystander, auditor, attender, utterance, utterer, disciple and unbeliever.