Crackpot vs Dull

Crackpot

name
  • A village in Swaledale, North Yorkshire, England 

Dull

name
  • A village in Perth and Kinross council area, Scotland. 

  • A surname. of Scottish and German origin. 

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