crimson vs horse chestnut

crimson

noun
  • A deep, slightly bluish red. 

adj
  • Having a deep red colour. 

  • Immodest. 

verb
  • To dye with crimson or deep red; to redden. 

  • To become crimson or deep red; to blush. 

horse chestnut

noun
  • The large nutlike seed of these trees. 

  • Any of several tree species of genus Aesculus, especially Aesculus hippocastanum, common in temperate northern hemisphere. 

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