contaminate vs pejorate

contaminate

verb
  • To infect, often with bad objects 

  • To soil, stain, corrupt, or infect by contact or association. 

  • To make something dangerous or toxic by introducing impurities or foreign matter. 

  • To make unfit for use by the introduction of unwholesome or undesirable elements. 

pejorate

verb
  • To make or become worse; to deteriorate or to worsen. 

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