overmuch vs so much

overmuch

noun
  • An excessive amount; too much. 

adj
  • Excessive. 

det
  • Very much; too much 

adv
  • Too much; overly much 

so much

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

  • A demonstrated amount. 

adj
  • To such a quantity, degree etc. 

adv
  • To a certain degree or extent 

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