| competitor(noun, person, conflict, opposition, job) |
| contestant(noun, animal, person, tough, sport) |
| opponent(noun, person, conflict, opposition, agent) |
| rival(noun, person, conflict, opposition, agent) |
| adversary(noun, person, opposition, agent, rebel) |
| antagonist(noun, person, opposition, agent, rebel) |
| enemy(noun, person, opposition, someone, rival) |
| entrant(noun, person, opposition, job, opponent) |
| foe(noun, person, opposition, agent, villain) |
| combatant(noun, person, tough, opposition, opponent) |
| challenger(noun, animal, sport, opponent, competitor) |
| competition(noun, person, conflict, opponent, competitor) |
| gladiator(noun, combatant) |
| player(noun, animal, sport, competitor, participant) |
| pugilist(noun, tough, opponent, champion, mercenary) |
| battler(noun, tough, competitor, participant, bodyguard) |
| fighter(noun, person) |
| opposition(noun, agent, rebel, criminal, rival) |
| disputant(noun, opposition, agent, villain, rebel) |
| struggler |