commission agent vs intermediary

commission agent

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

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

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

intermediary

noun
  • An agent acting as a mediator between sides to facilitate agreement or cooperation. 

  • One or several stages of an event which occurs after the start and before the end. 

  • A person or organisation in an intermediate position (in a transaction, agreement, supply chain etc.) 

adj
  • Intermediate. 

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