flak vs objurgation

flak

noun
  • Adverse criticism. 

  • A public-relations spokesperson. 

  • Anti-aircraft shell fire. 

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

objurgation

noun
  • A strong rebuke or scolding. 

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