denigrator

denigrate +‎ -or

denigrator (plural denigrators)

1. One who denigrates.
   • 2009 August 24, Janet Maslin, “Scarecrow, Lion, Tin Man and Freud, Too”, in New York Times‎:

     Among Baum’s many incarnations were these: military school student, actor, poultry expert, newspaperman, retailer, window dresser, women’s rights advocate, racist denigrator of American Indians and early Hollywood filmmaker.

• in regard to

Borrowed from Latin denigrator.

denigrator m (plural denigratori)

1. denigrator, depreciator