| disputer(noun, opponent, enemy, attacker, critic) |
| doubter(noun, opponent, enemy, attacker, critic) |
| faultfinder(noun, opponent, enemy, attacker, critic) |
| fretter(noun, opponent, enemy, attacker, critic) |
| hypercritic(noun, opponent, enemy, attacker, critic) |
| muckraker(noun, opponent, enemy, attacker, critic) |
| mud-slinger(noun, opponent, enemy, attacker, critic) |
| nagger(noun, opponent, enemy, attacker, critic) |
| nit-picker(noun, opponent, enemy, attacker, critic) |
| panner(noun, opponent, enemy, attacker, critic) |
| quibbler(noun, opponent, enemy, attacker, critic) |
| reviler(noun, opponent, enemy, attacker, critic) |
| scolder(noun, opponent, enemy, attacker, critic) |
| sidewalk superintendent(noun, expression, opponent, enemy, attacker) |
| worrier(noun, opponent, enemy, attacker, critic) |
| zapper(noun, opponent, enemy, attacker, critic) |
| adversary(noun, opposition, agent, rebel, criminal) |
| agent(noun, opposition, villain, rebel, criminal) |
| antagonist(noun, opposition, agent, rebel, criminal) |
| archenemy(noun, opposition, agent, villain, rebel) |