tolerate vs vitiate

tolerate

verb
  • To bear, withstand. 

  • To allow or permit without explicit approval, usually if it is perceived as negative. 

vitiate

verb
  • To make something ineffective, to invalidate. 

  • To debase or morally corrupt. 

  • To spoil, make faulty; to reduce the value, quality, or effectiveness of something. 

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