fund vs richen

fund

verb
  • To pay or provide money for. 

  • To form a debt into a stock charged with interest. 

  • To place (money) in a fund. 

noun
  • A sum or source of money. 

  • An organization managing such money. 

  • A large supply of something to be drawn upon. 

  • A money-management operation, such as a mutual fund. 

richen

verb
  • To make or render rich or richer. 

  • To become rich or richer; become superior in quality, condition or effectiveness. 

  • To gain richness; become heightened or intensified in brilliancy. 

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