adhesion vs duty

adhesion

noun
  • An agreement to adhere. 

  • An abnormal union of surface by the formation of new tissue resulting from an inflammatory process. 

  • Persistent attachment or loyalty. 

  • The ability of a substance to stick to an unlike substance. 

  • The binding of a cell to a surface or substrate. 

  • The frictional grip on a surface, of wheels, shoes etc. 

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