Biro vs Stick

Biro

name

  • A brand of ballpoint pen: see biro. 

  • A surname. 

Stick

name

  • The Chapman Stick, an electric musical instrument devised by Emmett Chapman. 

noun

  • A member of the Official IRA. 

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