inferno vs spiritual world

inferno

noun
  • A place or situation resembling Hell. 

  • A large fire; a conflagration. 

spiritual world

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

  • The afterlife. 

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