participants

People taking part

Participants are people who take part in something—an event, activity, study, or discussion.

The word emphasizes active involvement rather than mere presence: All participants must sign a waiver.

Research studies recruit participants; meetings have participants rather than just attendees.

The singular participant works as noun or adjective: a participant observer.

spectators

audience

Gathered viewers collectively

witnesses · bystanders · gallery · crowd · fans · supporters · followers · enthusiasts · patrons · congregation

attendees

registrants

Those officially signed up

guests · members · entrants · sign-ups · subscribers · recruits · newcomers · inductees · affiliates · associates

collaborators

contributors

Those who give help

members · volunteers · cooperators · co-authors · coinvestigators · working group · task force · committee members · project team · focus group

subjects

respondents

Those who answer queries

sample · control group · test group · interviewees · focus group · case studies · human subjects · data sources · informants

competitors

contestants

Competition participants

challengers · entrants · finalists · semifinalists · athletes · players · racers · fighters · combatants · underdogs

Categories
Opposites
active involvement

participantsspectators

Those who observe events

observers · onlookers · bystanders · viewers · watchers

role in organizing/controlling

participantsorganizers

Those who coordinate activities

hosts · administrators · coordinators · facilitators · bosses

inclusion/exclusion

participantsoutsiders

Those not belonging

dropouts · absentees · abstainers · withdrawers · boycotters

Phrases
Family

participant, nonparticipant, nonparticipants

Familiarity
Top 50,000
Profile
Known to kids · Used worldwide · Timeless · Everyday, not technical · Rated G