compulsion vs intrusive thought

compulsion

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

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

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

intrusive thought

noun
  • an unwelcome involuntary thought, image or idea 

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