caryopsis vs fruitcake

caryopsis

noun
  • A type of fruit in which the fruit skin is stuck to the seed coat; especially the grain of a cereal. 

fruitcake

noun
  • A cake containing dried fruits and, optionally, nuts, citrus peel and spice. 

  • A crazy or eccentric person. 

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