bribery vs chantage

bribery

noun
  • the activity of giving, offering or accepting bribes 

  • the making of illegal payment, or bribes, to persons in official positions as a means of influencing their decisions 

chantage

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

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