dismission vs resignation

dismission

noun
  • Removal from office; termination of employment or services, or position in ones affections. 

  • The act of dismissing or sending away (someone). 

  • The setting aside (of something) from consideration. 

resignation

noun
  • The act of resigning. 

  • A written or oral declaration that one resigns. 

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

  • An uncomplaining acceptance of something undesirable but unavoidable. 

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