perceiver Synonyms

percipient observer beholder viewer spectator seer antennule passer-by palpus watcher witness witnesser looker-on attestant gawker onlooker rubberneck comprehender passerby noticer looker grasper apprehender attestor audience bystander commentator conceiver deponent descrier detector discerner espier eyewitness fan fathomer gaper gazer glossator sightseer