rebut vs repudiate

rebut

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

  • To drive back or beat back; to repulse. 

repudiate

verb
  • To reject the truth or validity of; to deny. 

  • To be repudiated. 

  • To refuse to have anything to do with; to disown. 

  • To refuse to pay or honor (a debt). 

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