Cat vs Tiff

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. 

Tiff

name

  • A diminutive of the female given name Tiffany. 

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