2 answers
(click or scroll down)
Synonyms for actor: performer, player, thespian, artist, thesp
Antonyms for actor: spectator, nonactor, observer
Synonyms for audience: spectators, viewers, crowd, attendees
Antonyms for audience: performers, actors, cast
Synonyms for setting: backdrop, scene, environment, context
Antonyms for setting: unset, unsettle, disorder, disarray