Bengal almond vs umbrella tree

Bengal almond

noun
  • The Indian almond, Terminalia catappa. 

umbrella tree

noun
  • Terminalia catappa, the Indian almond. 

  • Magnolia tripetala, the umbrella magnolia. 

  • Musanga cecropioides, the African corkwood. 

  • Vachellia tortilis, the umbrella thorn. 

  • Polyscias murrayi, an Australian rainforest tree. 

  • Schefflera actinophylla, the octopus tree. 

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