so much vs substantial

so much

adj
  • To such a quantity, degree etc. 

adv
  • To a certain degree or extent 

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

  • A demonstrated amount. 

substantial

adj
  • Large in size, quantity, or value; ample; significant. 

  • Most important; essential. 

  • Not imaginary; real; actual; true; veritable. 

  • Having a substance; actually existing. 

  • Corporeal; material; firm. 

  • Possessed of goods or an estate; moderately wealthy. 

  • Satisfying; having sufficient substance to be nourishing or filling. 

  • Having good substance; strong; stout; solid; firm. 

noun
  • Anything having substance; an essential part. 

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