witness
wit-ness
verb
To see an event or incident happen with your own eyes.
"She witnessed the car crash."
noun
Something that serves as evidence or proof of a fact or truth.
"His success is a witness to his dedication."
noun
A person who sees an event, especially a crime or accident, occur.
"The police interviewed a key witness."
Thesaurus
Synonyms: witnesser, informant, watcher, spectator, viewer, looker, see, find, attestor, attestant, attestator