almond tree vs bitter almond

almond tree

noun

  • The tree that bears the almond, Prunus amygdalus. 

  • The Indian almond, Terminalia catappa. 

bitter almond

noun

  • A tree of the species Prunus amygdalus (order Rosales). 

  • The seed of this tree, which is unpalatably bitter and bears many times the cyanide of the sweet almond. 

  • A tree of the species Brabejum stellatifolium (order Proteales). 

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