grave vs spiritual world

grave

noun
  • Deceased people; the dead. 

  • Death, destruction. 

  • Any place of interment; a tomb; a sepulcher. 

  • An excavation in the earth as a place of burial 

  • A written accent used in French, Italian, and other languages. è is an e with a grave accent (`). 

  • A count, prefect, or person holding office. 

adj
  • Serious, in a negative sense; important, formidable. 

  • Low in pitch, tone etc. 

  • Characterised by a dignified sense of seriousness; not cheerful. 

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 grave and spiritual world occurred in a corpus of books? (source: Google Ngram Viewer )