barmaster vs custodian

barmaster

noun
  • An officer of the barmote. 

  • A local judge among miners. 

custodian

noun
  • A person entrusted with the custody or care of something or someone; a caretaker or keeper. 

  • a janitor; a cleaner 

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