| assailant(noun, opposition, agent, villain, rebel) |
| assassin(noun, opposition, agent, villain, rebel) |
| backseat driver(noun, expression, opponent, enemy, attacker) |
| bad person(expression, opposition, agent, villain, rebel) |
| bandit(noun, opposition, agent, villain, rebel) |
| betrayer(noun, opposition, agent, villain, rebel) |
| blamer(noun, opponent, enemy, attacker, critic) |
| competitor(noun, opposition, agent, villain, rebel) |
| complainant(noun, opponent, enemy, attacker, censor) |
| complainer(noun, opponent, enemy, attacker, censor) |
| contender(noun, opposition, agent, villain, rebel) |
| criminal(noun, opposition, agent, villain, rebel) |
| debunker |
| decreaser |
| defiler(noun, opposition, agent, villain, rebel) |
| disapprover(noun, opponent, enemy, attacker, critic) |
| disputant(noun, opposition, agent, villain, rebel) |
| disputer(noun, opponent, enemy, attacker, critic) |
| dissenter(radical, revolutionary, subversive) |
| doorknocker |