annul vs call back

annul

verb
  • To formally revoke the validity of. 

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

call back

verb
  • To request someone's return. 

  • To telephone someone again at a more convenient time. 

  • To return to a shop or residence one has previously visited. 

noun
  • Request for a second interview or audition, following a successful initial interview. 

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