Hell vs underworld

Hell

name
  • Any of various places so named. 

  • A village in Stjørdal, Trøndelag, Norway. 

underworld

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

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

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

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