Crystal vs Tombstone

Crystal

name
  • A city and town in North Dakota. 

  • A surname. 

  • A female given name from English. 

  • A ghost town in Colorado. 

  • A town in Maine. 

  • A town in Wisconsin. 

  • A city in Minnesota. 

  • A census-designated place in New Mexico. 

Tombstone

name
  • A city in southeastern Arizona. 

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