| competitor(noun, animal, person, conflict, opposition) |
| opponent(noun, person, conflict, opposition, rival) |
| antagonist(noun, person, opposition, rival, opponent) |
| adversary(noun, person, match, opposition, rival) |
| contender(noun, animal, person, tough, sport) |
| enemy(noun, person, match, opposition, rival) |
| rival(noun, person, conflict, opposition, opponent) |
| combatant(noun, person, opposition, opponent, combatant) |
| entrant(noun, person, opposition, job, application) |
| foe(noun, person, match, opposition, rival) |
| player(noun, animal, person, sport, opposition) |
| pugilist(noun, tough, opponent, champion, combatant) |
| battler(noun, combatant, competitor, fighter) |
| disputant(noun, opposition, rival, opponent, champion) |
| militant(noun, tough, opponent, champion, combatant) |
| participant(noun, application, member, submission, entry) |
| brawler(noun, tough, opponent, champion, combatant) |
| bully(noun, tough, opponent, champion, combatant) |
| duelist(noun, tough, opponent, champion, combatant) |
| gladiator(noun, tough, opponent, champion, combatant) |