disavow vs disown

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. 

disown

verb
  • To refuse to own, or to refuse to acknowledge one’s own. 

  • To repudiate any connection to; to renounce. 

  • To detach (a job or process) so that it can continue to run even when the user who launched it ends his/her login session. 

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