Synonyms for Defamation (same or very similar meaning)
WordNet sense 1 (a false accusation of an offense or a malicious misrepresentation of someone's words or actions):
calumniation, calumny, obloquy, traducement, hatchet jobWordNet sense 2 (an abusive attack on a person's character or good name):
aspersion, denigration, slanderFrom the ODE community, based on WordNetadd/edit