overmuchness vs plethora

overmuchness

noun
  • The quality or state of being in excess; superabundance. 

plethora

noun
  • An excessive amount or number; an abundance. 

  • Excess of blood in the skin, especially in the face and especially chronically. 

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