different between backbiting vs blackmailing

English

From Middle English bakbitynge, bacbiting, bacbitung, equivalent to backbite +? -ing.

backbiting (countable and uncountable, plural backbitings)

From Middle English bakbytynge, equivalent to backbite +? -ing.

backbiting (comparative more backbiting, superlative most backbiting)

Slanderous or speaking badly, especially of a person without that person's knowledge.

backbiting

blackmailing

blackmailing (plural blackmailings)

The act of one who blackmails.
- 1934, Winston Churchill, Marlborough: His Life and Times (book 2, page 51)
  All the materials, therefore, existed for an interminable series of hagglings, bargainings, and blackmailings.

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