Niflheim vs hellfire

Niflheim

name
  • In Germanic and Norse cosmology, the Norse underworld, location of the domain Hel and of the realm of Hel, the goddess of the dead. 

hellfire

adj
  • Of or relating to a violent, apocalyptic and ultimate day of reckoning and judgment; usually characterizing a form of Christian preaching. 

intj
  • hell; damn; blast 

noun
  • The fire of Hell. 

  • Fire produced by the Devil, or a similar supernatural creature connected to Hell. 

  • A fire that burns with unusual heat or ferocity. 

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