formalize vs revoke

formalize

verb
  • To give something a formal or official standing. 

  • To act with formality. 

  • To give something a definite form; to shape. 

revoke

noun
  • The act of revoking in a game of cards. 

  • A violation ranked in seriousness somewhat below overt cheating, with the status of a more minor offense only because, when it happens, it is usually accidental. 

  • A renege; a violation of important rules regarding the play of tricks in trick-taking card games serious enough to render the round invalid. 

verb
  • To cancel or invalidate by withdrawing or reversing. 

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