PARTICIPANT Synonyms: 21 Similar and Opposite Words - Merriam-Webster
https://www.merriam-webster.com/thesaurus/participant
WEBSynonyms for PARTICIPANT: participator, player, actor, partner, sharer, partaker, party, assistant; Antonyms of PARTICIPANT: observer, spectator, nonparticipant, bystander, onlooker, watcher, wallflower, looker-on
DA: 35 PA: 51 MOZ Rank: 73