annul vs delete

annul

verb
  • To formally revoke the validity of. 

  • To dissolve (a marital union) on the grounds that it is not valid. 

delete

verb
  • To remove, get rid of or erase, especially written or printed material, or data on a computer or other device. 

  • To kill or murder. 

  • To defeat or dominate. 

noun
  • A remainder of a music or video release. 

  • The delete character (U+007F or %7F). 

  • A deletion. 

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