confirm vs unauthorize

confirm

verb
  • To administer the sacrament of confirmation on (someone). 

  • To assure the accuracy of previous statements. 

  • To strengthen; to make firm or resolute. 

unauthorize

verb
  • To disown the authority of; to repudiate. 

  • To withdraw authorization or permissions from. 

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