looker-on β a person who looks on; onlooker; witness; spectator.
perceiver β to become aware of, know, or identify by means of the senses: I perceived an object looming through the mist.
playgoer β a person who attends the theater often or habitually.
seer β a unit of weight in India, varying in value but usually 1/40 of a maund: the government ser is divided into 80 tolas of 180 English grains and equals nearly 2 pounds 1 ounce avoirdupois (950 grams).
standee β a person who stands, as a passenger in a train, a spectator at a theater, etc., either because all the seats are taken or because standing room is cheaper than a seat.
watcher β a person who watches or who keeps watch.
witness β to see, hear, or know by personal presence and perception: to witness an accident.
gazer β to look steadily and intently, as with great curiosity, interest, pleasure, or wonder.
congregation β The people who are attending a church service or who regularly attend a church service are referred to as the congregation.
crowd β A crowd is a large group of people who have gathered together, for example to watch or listen to something interesting, or to protest about something.
gallery β a raised area, often having a stepped or sloping floor, in a theater, church, or other public building to accommodate spectators, exhibits, etc.