Gap vs Slaughter

Gap

name

  • A town, the capital of the department of the Hautes-Alpes, Provence-Alpes-Côte d'Azur, France. 

Slaughter

name

  • A town in Louisiana. 

  • A surname. 

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