Back vs Downhill

Back

name

  • A settlement on the Isle of Lewis, Western Isles council area, Scotland (OS grid ref NB4840). 

  • A surname. 

Downhill

name

  • A hamlet in St Eval parish, Cornwall, England (OS grid ref SW8669). 

  • A northern suburb of Sunderland, Tyne and Wear, England (OS grid ref NZ3559). 

  • A coastal village and beach (Downhill Strand) in County Londonderry, Northern Ireland. 

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