coercion vs compulsion

coercion

noun
  • Actual or threatened force for the purpose of compelling action by another person; the act of coercing. 

  • A specific instance of coercing. 

  • Use of physical or moral force to compel a person to do something, or to abstain from doing something, thereby depriving that person of the exercise of free will. 

  • Conversion of a value of one data type to a value of another data type. 

  • The process by which the meaning of a word or other linguistic element is reinterpreted to match the grammatical context. 

compulsion

noun
  • The use of authority, influence, or other power to force (compel) a person or persons to act. 

  • An irrational need or irresistible urge to perform some action, often despite negative consequences. 

  • The lawful use of violence (i.e. by the administration). 

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