fruitcake vs kook

fruitcake

noun
  • A crazy or eccentric person. 

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

kook

noun
  • An eccentric, strange or crazy person. 

  • A boardsport participant who lacks style or skill; a newbie who acts as if they are better at the sport than they are. 

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