Borstal vs Ripple

Borstal

name

  • A suburb, formerly a village, in Rochester, Medway borough, Kent, England (OS grid ref TQ7366). 

Ripple

name

  • A village and civil parish in Dover district, Kent, England (OS grid ref TR3450). 

  • A village and civil parish in Malvern Hills district, Worcestershire, England (OS grid ref SO8737). 

  • A surname. 

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