Synonyms of onlookers

2 Syllables
playgoer, showgoer, gated, hearers, playgoers, showgoers, witness, watcher, viewer, sightseer, hearer, gating
3 Syllables
theatergoer, observer, looker-on, moviegoer, moviegoers, theatergoers, beholder, audience, bystander, eyewitness, spectator