Stick vs chieftain

Stick

noun

  • A member of the Official IRA. 

name

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

chieftain

noun

  • A leader of a group. 

  • A leader of a clan or tribe. 

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