azedarach vs neem

azedarach

noun
  • An Asiatic tree (Melia azedarach), common in the southern United States, commonly called bead tree, chinaberry, etc. 

  • The bark of the roots of the azedarach, used as a cathartic and emetic 

neem

noun
  • Azadirachta indica, a large, mostly evergreen tree from India, whose seeds yield the insecticide azadirachtin. 

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