accede vs rebut

accede

verb
  • To agree or assent to a proposal or a view; to give way. 

  • To become a party to an agreement or a treaty. 

  • To come to an office, state or dignity; to attain, assume (a position). 

rebut

verb
  • To deny the truth of something, especially by presenting arguments that disprove it. 

  • To drive back or beat back; to repulse. 

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