Grain vs Isle

Grain

name

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

  • A surname. 

Isle

name

  • A city in Minnesota. 

  • A river in southwestern France, which flows into the Dordogne. 

  • A river in Somerset, England, which flows into the River Parrett. 

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