intermediary vs shop steward

intermediary

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

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

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

adj
  • Intermediate. 

shop steward

noun
  • A local member of a trade union elected to represent his fellow workers in discussions with the management at a workplace. 

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