participant
noun
[ pɑːˈtɪsɪp(ə)nt ]
• a person who takes part in something.
• "staff are to be active participants in the decision-making process"
Similar:
participator,
contributor,
sharer,
party,
member,
partaker,
entrant,
competitor,
player,
contestant,
contender,
candidate,
Origin:
late Middle English: from Latin participant-, literally ‘sharing in’, from the verb participare (see participate).