calumniator
/kəˈlʌmniˌeɪtər/
noun
- A person who makes false and harmful statements about someone in order to damage their reputation.
- In the small town, the local gossip was known as a calumniator, always twisting the truth.
- The journalist was accused of being a calumniator after publishing unverified accusations.
- The politician called his opponent a calumniator who spread lies about his charity work.