spiritual world vs undeadliness

spiritual world

noun
  • The afterlife. 

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

undeadliness

noun
  • The condition of not being susceptible to death; immortality. 

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