infusion vs instillation

infusion

noun
  • The act of installing a quality into a person. 

  • The administration of liquid substances directly into a vein for medical purposes; perfusion. 

  • The act of steeping or soaking a substance in liquid so as to extract medicinal or herbal qualities. 

  • A product consisting of a liquid which has had other ingredients steeped in it to extract useful qualities. 

instillation

noun
  • The act of instilling. 

  • That which is instilled. 

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