Backbiter

//ˈbæk.baɪt.ə(ɹ)// noun

Definitions

Noun
  1. 1
    A person who says nasty things about another person behind the second person's back: that is, out of their sight and hearing.

    "[…] here were no Gibers, Cenſurers, Backbiters, Pick-pockets, Highwaymen, Houſebreakers, Attorneys, Bawds, Buffoons, Gameſters, Politicians, Wits, ſplenetick tedious Talkers, Controvertiſts, Raviſhers, Murderers, Robbers, Virtuoſo's; […]"

  2. 2
    one who attacks the reputation of another by slander or libel wordnet

Etymology

From Middle English bakbitere, bakbytere, bacbitere, equivalent to backbite + -er.

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