barmaster vs warrant officer

barmaster

noun
  • An officer of the barmote. 

  • A local judge among miners. 

warrant officer

noun
  • An officer assigned to execute warrants and other writs. 

  • An officer holding rank by virtue of a warrant rather than a commission. 

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