excoriation vs impugnation

excoriation

noun
  • The act of excoriating or flaying. 

  • A severe verbal denouncing. 

  • The excoriated place, or the state of being excoriated or stripped of the skin; abrasion. 

impugnation

noun
  • The act of impugning 

  • The act of appealing or revoking 

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