Burn vs Swallow

Burn

name
  • A village and civil parish in Selby district, North Yorkshire, England (OS grid ref SE5928). 

  • A surname. 

Swallow

name
  • A village and civil parish in West Lindsey district, Lincolnshire, England (OS grid ref TA1703). 

  • A surname. 

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