accede vs disavow

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). 

disavow

verb
  • To strongly and solemnly refuse to own or acknowledge; to deny responsibility for, approbation of, and the like. 

  • To deny; to show the contrary of; to deny legitimacy or achievement of any kind. 

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