Crackpot vs Grain

Crackpot

name

  • A village in Swaledale, North Yorkshire, England 

Grain

name

  • A village on the Isle of Grain, Medway borough, Kent, England (OS grid ref TQ8876). 

  • A surname. 

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