bribe vs protection money

bribe

noun
  • Something (usually money) given in exchange for influence or as an inducement to breaking the law. 

  • That which seduces; seduction; allurement. 

verb
  • To give a bribe to; specifically, to ask a person to do something against his/her original will, in exchange for some type of reward or relief from potential trouble. 

  • To gain by a bribe; to induce as by a bribe. 

protection money

noun
  • Money paid, especially at regular intervals, to criminals or to corrupt officials who threaten to cause harm to the payer or to his or her business if the money is not paid. 

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