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Definition of participant : 1. A participator; a partaker.
2. Sharing; participating; having a share of part.

Synonyms:

thespian, player, shareholder, partaker, member, histrion, associate, actor, role player, a party to, participate, copartner, cooperator, instrumentalist, party, partner, sharer, musician

Usage examples:

• He remembered how many of his cigars he had smoked with Mr. Flack and how universal a participant he had made him. - "The Reverberator", Henry James.
• He was an observer rather than a participant in life. - "Comrade Yetta", Albert Edwards.
• Happily, through the kindness of my Portuguese friend, I was kept from being an active participant in scenes of which I was an unwilling witness. - "Drift from Two Shores", Bret Harte.