purgatory vs suffering

purgatory

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

adj
  • Tending to cleanse; expiatory. 

suffering

noun
  • The condition of someone who suffers; a state of pain or distress. 

adj
  • Experiencing pain; characterized by suffering. 

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