accusation vs exculpation

accusation

noun
  • The act of accusing. 

  • A formal charge brought against a person in a court of law. 

  • An allegation. 

exculpation

noun
  • The act of exculpating from alleged fault or crime. 

  • That which exculpates; an excuse. 

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