Synonyms of 'bystander'

abutter, attestator, bird-watcher, borderer, compurgator, deponent, drugstore cowboy, earwitness, eyewitness, gaper, goggler, informant, informer, kibitzer, looker, looker-on, neighbor, observer, onlooker, percipient, seer, spectator, tangent, viewer, voucher, watcher, witness