depravation vs vitiation

depravation

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

  • Detraction; depreciation. 

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

  • Change for the worse; deterioration; morbid perversion. 

vitiation

noun
  • moral corruption 

  • an abolition or abrogation 

  • a reduction in the value, or an impairment in the quality of something 

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