cedar vs grapefruit

cedar

noun
  • A flowering tree of the family Meliaceae, especially of the genera Cedrela or Toona. 

  • A coniferous tree of the family Cupressaceae, especially of the genera Juniperus, Cupressus, Calocedrus, or Thuja. 

  • A coniferous tree of the genus Cedrus in the family Pinaceae. 

  • The aromatic wood from a Cedrus tree, or from any of several not closely related trees. 

grapefruit

noun
  • The large spherical tart fruit produced by this tree. 

  • The tree of the species Citrus paradisi, a hybrid of pomelo (Citrus maxima) and sweet orange. 

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