Derogator is a word which refers to someone who belittles or speaks ill of someone else. Synonyms for derogator include detractor, slanderer, deprecator, disparager, and defamer. A detractor is someone who criticizes or speaks negatively about someone or something. Slanderer refers to a person who makes false and damaging statements about someone. A deprecator puts down or belittles someone or something. A disparager is a person who speaks ill of someone or something with the intention of belittling them. Lastly, a defamer is someone who makes false and damaging statements about another person or entity. These synonyms can help you accurately describe someone who diminishes another person's worth or reputation.