anti-aircraft vs denunciation

anti-aircraft

noun
  • An anti-aircraft artillery organization. 

  • Anti-aircraft artillery. 

  • Anti-aircraft fire. 

adj
  • Intended to attack aircraft. 

denunciation

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

  • The announcement of termination (of a treaty). 

  • Proclamation; announcement; a publishing. 

  • The act of denouncing; an accusation made in public 

  • An open declaration of personal fault. 

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