asperse vs backbite

asperse

verb
  • To falsely or maliciously charge another; to slander. 

  • To sprinkle or scatter (liquid or dust). 

backbite

verb
  • To make spiteful slanderous or defamatory statements about someone. 

  • To attack from behind or when out of earshot with spiteful or defamatory remarks. 

  • To speak badly of an absent individual. 

noun
  • One who engages in backbiting; a backbiter. 

How often have the words asperse and backbite occurred in a corpus of books? (source: Google Ngram Viewer )