authorize vs call back

authorize

verb
  • To grant (someone) the permission or power necessary to do (something); to permit; to sanction or consent to. 

call back

noun
  • Request for a second interview or audition, following a successful initial interview. 

verb
  • To request someone's return. 

  • To telephone someone again at a more convenient time. 

  • To return to a shop or residence one has previously visited. 

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