divorce vs duty

divorce

noun
  • The legal dissolution of a marriage. 

  • A separation of connected things. 

  • The separation of a bonded pair of animals. 

verb
  • To legally dissolve a marriage between two people. 

  • To end one's own marriage to (a person) in this way. 

  • To separate something that was connected. 

  • To obtain a legal divorce. 

duty

noun
  • That which one is morally or legally obligated to do. 

  • The state of being at work and responsible for or doing a particular task. 

  • A tax placed on imports or exports; a tariff. 

  • The efficiency of an engine, especially a steam pumping engine, as measured by work done by a certain quantity of fuel; usually, the number of pounds of water lifted one foot by one bushel of coal (94 lbs. old standard), or by 1 cwt. (112 lbs., England, or 100 lbs., United States). 

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