fruitcake vs querulant

fruitcake

noun
  • A crazy or eccentric person. 

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

querulant

noun
  • One who has obsessive feelings of having been wronged. 

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