disconnection vs sundering

disconnection

noun
  • Severance of a physical connection. 

  • Absence of rapport; the nonexistence of, or a breakdown of, effective communication. 

  • Unexpected termination of a telephone connection. 

sundering

noun
  • The act by which something is sundered. 

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