observer Synonyms

beholder perceiver monitor percipient onlooker viewer bystander looker-on watcher witness looker lookout spotter spectator commentator spectatrix verifier sentinel watchdog seer scrutinizer scrutineer scout triandrous testifier spectatress spy stander-by signer supervisor signalman surveyor student watchman witnesser banksman fly on the wall passerby reconnoiterer sightseer televiewer onlookers Watchers monitors inactive person spectators nonparticipant writer radar viewers