The best replacement for participant is subject.

The best alternatives to participant are rated as following:
★★★★★  subject
★★★★  spectator
★★★★  participator
★★  observer
★★  respondent
★★  attendee
★  complete observer
★  non participant
★  first-person observer
  participant as observer
  passive participant

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Google Trends

Scale is based on the average worldwide traffic of participant in all years. Click on graph for more.
participant
subject
spectator