affliction vs infirmity

affliction

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

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

infirmity

noun
  • a moral weakness or defect 

  • feebleness, frailty or ailment, especially due to old age. 

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