insubordination vs resignation

insubordination

noun
  • The quality or state of being insubordinate; disobedience to lawful authority; specifically, an employee's failure or refusal to comply with a request or an assignment given by his/her supervisor. 

resignation

noun
  • A written or oral declaration that one resigns. 

  • The form by which a vassal returns the feu into the hands of a superior. 

  • The act of resigning. 

  • An uncomplaining acceptance of something undesirable but unavoidable. 

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