commission agent vs roundsman

commission agent

noun
  • A merchant earning a commission by selling goods belonging to others. 

  • An agent entrusted with the possession of goods to be sold in the agent's name. 

  • A person entrusted with a confidential task, often secretly to place a bet. 

roundsman

noun
  • A worker who makes rounds, especially in order to deliver goods. 

  • A policeman who acts as inspector. 

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