wrongdoer

As nouns the difference between criminal and wrongdoer

is that criminal is a person who is guilty of a crime, notably breaking the law while wrongdoer is someone who does wrong, either morally, ethically or in contravention of a law.

As an adjective criminal

is being against the law; forbidden by law.

As nouns the difference between wrongdoer and lawbreaker

is that wrongdoer is someone who does wrong, either morally, ethically or in contravention of a law while lawbreaker is one who breaks (violates) the law, a criminal.