Boo vs Fur

Boo

name

  • The Boko language. 

  • A community in Nacka, Stockholm, central Sweden. 

Fur

name

  • The language of this people. 

noun

  • A member of a Nilo-Saharan people of western Sudan. 

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