malapropism vs mistreatment

malapropism

noun
  • The blundering use of an absurdly inappropriate word or expression in place of a similar-sounding one. 

  • An instance of this; malaprop. 

mistreatment

noun
  • Cruel, abusive , bad, unfair, or thoughtless treatment of a person or animal (only rarely of an object or a machine; usually: mishandle). 

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