resignation vs undergoing

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. 

undergoing

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