ergotism vs exemption

ergotism

noun
  • A logical deduction. 

  • The usage of ergot infested grain to poison animals. 

  • The effect of long-term ergot poisoning, traditionally due to the ingestion of the alkaloids produced by the fungus Claviceps purpurea which infects rye and other cereals, and more recently by the action of a number of ergoline-based drugs, consisting of convulsive and gangrenous symptoms. 

  • The plant disease caused by ergot. 

exemption

noun
  • A deduction from the normal amount of taxes. 

  • The state of being exempt; immunity. 

  • Freedom from a defect or weakness. 

  • An act of exempting. 

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