gravamen vs nothing

gravamen

noun
  • A grievance complained of. 

  • The essence or ground of a complaint. 

  • 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. 

nothing

pron
  • Not any thing; no thing. 

  • An absence of anything, including empty space, brightness, darkness, matter, or a vacuum. 

noun
  • Something trifling, or of no consequence or importance. 

  • A trivial remark especially in the term sweet nothings. 

  • A nobody (insignificant person). 

How often have the words gravamen and nothing occurred in a corpus of books? (source: Google Ngram Viewer )