exoneration vs unburdening

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. 

unburdening

noun
  • The act by which one unburdens oneself. 

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