commission agent vs dealer

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. 

dealer

noun
  • One who deals in goods, especially automobiles; a middleman. 

  • A particular type of stock broker or trader. 

  • A drug dealer, one who peddles illicit drugs. 

  • The person who deals the cards in a card game. 

  • One who deals or metes out anything. 

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