chantage vs compelling

chantage

noun
  • blackmail; the extortion of money by threats of scandalous revelations 

compelling

noun
  • An act of compulsion; an obliging somebody to do something. 

adj
  • Strongly or irresistibly evoking interest or attention. 

  • Forceful. 

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