denunciation vs flak

denunciation

noun
  • The act of denouncing; an accusation made in public 

  • The announcement of termination (of a treaty). 

  • Proclamation; announcement; a publishing. 

  • That by which anything is denounced; threat of evil; public menace or accusation; arraignment. 

  • An open declaration of personal fault. 

flak

noun
  • Adverse criticism. 

  • A public-relations spokesperson. 

  • Anti-aircraft shell fire. 

  • Ground-based anti-aircraft guns firing explosive shells. 

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