arborvitae vs bead tree

arborvitae

noun
  • Any of several North American or Asian conifers, of the genera Thuja and Thujopsis or the species Platycladus orientalis, grown for timber or ornament. 

  • The white nerve tissue of the cerebellum that has a branching structure. 

bead tree

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

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