choice vs duty

choice

noun
  • The power to choose. 

  • One selection or preference; that which is chosen or decided; the outcome of a decision. 

  • Anything that can be chosen. 

  • Do I have a choice of what color to paint it? 

  • An option; a decision; an opportunity to choose or select something. 

  • The best or most preferable part. 

adj
  • Especially good or preferred. 

intj
  • Cool; excellent. 

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 choice and duty occurred in a corpus of books? (source: Google Ngram Viewer )