semantics vs sum and substance

semantics

noun
  • A branch of linguistics studying the meaning of words. 

  • The individual meanings of words, as opposed to the overall meaning of a passage. 

  • The meaning of computer language constructs, in contrast to their form or syntax. 

  • The study of the relationship between words and their meanings. 

sum and substance

noun
  • The essential meaning of written or spoken words; gist, crux. 

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