derogation vs exoneration

derogation

noun
  • An act which belittles; disparagement. 

  • The act of derogating; the temporary or partial nullification of a law. 

exoneration

noun
  • An act of disburdening, discharging, or freeing morally from a charge or imputation. 

  • The state of being disburdened or freed from a charge. 

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