overfullness vs plethora

overfullness

noun
  • The state of being excessively or abnormally full. 

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 overfullness and plethora occurred in a corpus of books? (source: Google Ngram Viewer )