beautify vs richen

beautify

verb
  • To make beautiful; to increase the beauty of. 

  • Synonym of pretty-print 

  • To make oneself beautiful. 

  • To become beautiful. 

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 beautify and richen occurred in a corpus of books? (source: Google Ngram Viewer )