pine nut vs stone pine

pine nut

noun
  • The edible seed of any of several species of evergreen pine, especially Pinus pinea, Pinus cembra, and Pinus cembroides. 

  • The flavor that results from mixing pineapple and coconut. 

stone pine

noun
  • A species of pine native of southern Europe, Pinus pinea. 

  • Swiss stone pine (Pinus cembra) 

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