depravation vs purity

depravation

noun
  • Detraction; depreciation. 

  • The state of being depraved or degenerated; degeneracy; depravity. 

  • Change for the worse; deterioration; morbid perversion. 

  • The act of depraving, or making anything bad; the act of corrupting. 

purity

noun
  • The state or degree of being pure. 

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