perdition vs purgatory

perdition

noun
  • Absolute ruin; downfall. 

  • Hell. 

  • Eternal damnation. 

purgatory

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

adj
  • Tending to cleanse; expiatory. 

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