longan vs rambutan

longan

noun
  • The fruit from the longan tree. 

  • An evergreen tree, Dimocarpus longan, of the Sapindaceae family, native to southern China. 

rambutan

noun
  • The fruit of this tree. 

  • A tree, Nephelium lappaceum, of Southeast Asia. 

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