active participant
- contributorOne who provides something
- engagedPledged to marry
- involvedParticipating or complicated
- playerGame participant
- doerPerson who acts
collaborator · stakeholder · volunteer · hands-on · immersed · committed · enthusiast · member · initiator · driver · mover · shaker · activist · agent · performer · practitioner · joiners · invested
engagement level
active participantbystander
One who observes nearby
spectator · onlooker · silent partner · wallflower · lurker
presence vs absence
active participantnonparticipant
One not involved
absentee · outsider · non-member · abstainer · no-show