quietus vs spiritual world

quietus

noun
  • Death. 

  • Final settlement (e.g., of a debt). 

  • A stillness or pause; something that quiets or represses; removal from activity. 

spiritual world

noun
  • The afterlife. 

  • A metaphysical plane of existence parallel to the material world and occupied by spirits and other unearthly forces. 

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