harm vs pollute

harm

verb
  • To cause injury to another; to hurt; to cause damage to something. 

noun
  • detriment; misfortune. 

  • physical injury; hurt; damage 

  • That which causes injury, damage, or loss. 

  • emotional or figurative hurt 

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. 

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