bead tree vs neem

bead tree

noun
  • Melia azedarach, a deciduous or semi-evergreen tree with poisonous fruit, native to India, Southeast Asia, and northern Australia. 

neem

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

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