Boo vs Bozo

Boo

name
  • The Boko language. 

  • A community in Nacka, Stockholm, central Sweden. 

Bozo

name
  • The Mande language of these people. 

noun
  • A member of a West African ethnic group located predominantly along the Niger River in Mali, famous for their fishing. 

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