pollute vs sterilize

pollute

verb
  • To make something harmful, especially by the addition of some unwanted product. 

  • To violate sexually; to debauch; to dishonour. 

  • To make something or somewhere less suitable for some activity, especially by the introduction of some unnatural factor. 

  • To corrupt or profane 

adj
  • Polluted; defiled. 

sterilize

verb
  • To make unable to produce; to make unprofitable. 

  • To deprive of the ability to procreate. 

  • To redact (a document), removing classified or sensitive material. 

  • To kill, deactivate (denature), or destroy (break apart) all living, viable microorganisms and spores on a surface, in a fluid, or contained in a compound, such as culture media or a medical product. 

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