The 'accuser' group
These nouns refer to someone who attacks, criticizes, or otherwise ill-treats someone.
accuser assailant attacker captor conqueror critic detractor interrogator killer oppressor pursuer tormentor
Sparks flew when Jean stormed into the staffroom and confronted her accuser, an industrial tribunal was told.
He said that at a personal level his interrogators had been friendly and that at no point was he abused.