nirvana vs purgatory

nirvana

noun
  • Complete cessation of suffering; a blissful state attained through realization of sunyata; enlightened experience. 

  • State of paradise; heightened or great pleasure. 

purgatory

adj
  • Tending to cleanse; expiatory. 

noun
  • Any situation where suffering is endured, particularly as part of a process of redemption. 

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