adulteration vs treatment

adulteration

noun
  • The action of adulterating, being mixed with extraneous material, illicit substitution of one substance for another. 

treatment

noun
  • Medical care for an illness or injury. 

  • A brief, third-person, present-tense summary of a proposed film. 

  • A treatise; a formal written description or characterization of a subject. 

  • The use of a substance or process to preserve or give particular properties to something. 

  • The process or manner of treating someone or something. 

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