badinage vs flak

badinage

noun
  • Playful raillery; banter. 

verb
  • To engage in badinage or playful banter. 

flak

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

  • A public-relations spokesperson. 

  • Anti-aircraft shell fire. 

  • Adverse criticism. 

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