flack vs peacemaking

flack

verb
  • To hang loosely; flag. 

  • To beat by flapping. 

  • To publicise, to promote. 

noun
  • A publicist, a publicity agent. 

peacemaking

noun
  • The act of reconciling two people or groups who disagree. 

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