Gehenna vs Niflheim

Gehenna

name
  • In rabbinical literature and Christian and Islamic scripture, the place where the souls of the wicked go after death, where they suffer eternal damnation or annihilation. 

  • The valley of Hinnom outside Jerusalem. 

  • Hell. 

  • A place of suffering and misery. 

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. 

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