assent vs resignation

assent

noun
  • agreement; act of agreeing 

verb
  • To agree to a proposal. 

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 assent and resignation occurred in a corpus of books? (source: Google Ngram Viewer )