purgatory vs wretchedness

purgatory

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

adj
  • Tending to cleanse; expiatory. 

wretchedness

noun
  • A state of prolonged misfortune, privation, or anguish. 

  • An unhappy state of mental or physical suffering. 

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