Stick vs adjutant

Stick

noun
  • A member of the Official IRA. 

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

adjutant

noun
  • Any bird of the genus Leptoptilos, a branch of the stork family (Ciconiidae) native to India and Southeast Asia. 

  • An assistant. 

  • A lower-ranking officer who assists a higher-ranking officer with administrative affairs. 

adj
  • Assistant; who helps a higher-ranking officer. 

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