Synonyms of eyewitness

2 Syllables
gazer, gawkers, viewers, witness, standee, clapper, watcher, firsthand, viewer, gawker, clappers, gazers
3 Syllables
witnesses, stander-by, beholders, observer, perceivers, observers, onlooker, attestant, looker-on, testifier, bystanders, onlookers, spectators, beholder, passer-by, bystander, perceiver, spectator, testifiers
4 Syllables
rubbernecker
5 Syllables
corroborator, corroborators