deadland vs underworld

deadland

noun
  • A place of death; a deadly land. 

  • The afterlife, especially in belief systems that do not include reward or punishment such as heaven and hell. 

  • Wasteland; a desert or other place that does not support life. 

underworld

noun
  • The world of the dead, located underneath the world of the living; the afterlife. 

  • That part of society that is engaged in crime or vice. 

  • The portion of a game that is set below ground. 

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