Cat vs Emerald

Cat

name

  • A diminutive of the female given names Catherine or Caitlin. 

noun

  • A Catalina flying boat. 

  • A piece of heavy machinery, such as a backhoe, of the Caterpillar brand. 

Emerald

name

  • A female given name from English. 

  • The Rural Municipality of Emerald No. 277, a rural municipality in eastern Saskatchewan, Canada. 

  • A town in Queensland, Australia. 

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