most vs so much

most

adv
  • To a great extent or degree; highly; very. 

  • Almost. 

  • Forms the superlative of many adjectives. 

pron
  • The greater part of a group, especially a group of people. 

noun
  • A record-setting amount. 

  • The greatest amount. 

  • The greater part. 

so much

adv
  • To a certain degree or extent 

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

  • A demonstrated amount. 

adj
  • To such a quantity, degree etc. 

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