fomentation vs suasion

fomentation

noun
  • Encouragement; excitation; instigation. 

  • A lotion or poultice applied to a diseased or injured part of the body. 

  • The act of fomenting; the application of warm, soft, medicinal substances, as for the purpose of easing pain by relaxing the skin, or of discussing (dispersing) tumours. 

suasion

noun
  • The act of urging or influencing; persuasion. 

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