great deal vs so much

great deal

noun
  • Large number, amount, or extent. 

  • Used other than figuratively or idiomatically: see great, deal. 

so much

noun
  • A particular amount, often a large or excessive amount. 

  • A demonstrated amount. 

adv
  • To a certain degree or extent 

adj
  • To such a quantity, degree etc. 

How often have the words great deal and so much occurred in a corpus of books? (source: Google Ngram Viewer )