backbiter

back·bite

B0010200 (băk′bīt′)v. back·bit (-bĭt′), back·bit·ten (-bĭt′n), back·bit·ing, back·bites v.tr. To speak spitefully or slanderously about (another).v.intr. To speak spitefully or slanderously about a person.

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back′bit′er n.

Thesaurus

Noun

1.

backbiter - one who attacks the reputation of another by slander or libeldefamer, libeler, maligner, slanderer, traducer, vilifierdepreciator, detractor, disparager, knocker - one who disparages or belittles the worth of something