affliction vs sadness

affliction

noun
  • A state of pain, suffering, distress or agony. 

  • Something which causes pain, suffering, distress or agony. 

sadness

noun
  • The state or emotion of being sad. 

  • An event in one's life that causes sadness. 

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