hod vs mailboat

hod

noun
  • A three-sided box mounted on a pole for carrying bricks, mortar, or other construction materials over the shoulder. 

  • The amount of material held by a hod (sense 1); a hodful. 

  • A blowpipe used by a pewterer. 

  • A receptacle for carrying coal, particularly one shaped like a bucket which is designed for loading coal or coke through the door of a firebox. 

  • A bookmaker's bag. 

mailboat

noun
  • A boat used to transport mail. 

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