concede vs rebut

concede

verb
  • To admit or agree to be true; to acknowledge. 

  • To yield or suffer; to surrender; to grant 

  • To yield or make concession. 

  • (of a bowler) to have runs scored off of one's bowling. 

  • To grant, as a right or privilege; to make concession of. 

  • To have a goal or point scored against 

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 concede and rebut occurred in a corpus of books? (source: Google Ngram Viewer )