colic vs gravamen

colic

noun
  • Severe fussiness and crying, especially of infants with certain medical conditions. 

  • A medicinal plant used to relieve such symptoms. 

  • Severe pains that grip the abdomen or the disease that causes such pains (due to intestinal or bowel-related problems). 

adj
  • Relating to the colon; colonic. 

gravamen

noun
  • The essence or ground of a complaint. 

  • A grievance complained of. 

  • A document sent by the Lower House of Convocation to the Upper House to inform the latter of certain grievances in the church. 

  • The essence or most important aspect of a piece of writing, a point of argument, etc.; the gist. 

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