Clough vs Swallow

Clough

name
  • A village and townland in County Down, Northern Ireland. 

  • A village in County Laois, Ireland. 

  • An extinct town in Meade County, South Dakota, United States. 

  • A surname transferred from the common noun. 

Swallow

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

  • A surname. 

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