captiousness vs flak

captiousness

noun
  • the state of being captious 

  • captious behaviour 

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 captiousness and flak occurred in a corpus of books? (source: Google Ngram Viewer )