interceder vs linkman

interceder

noun
  • One who intercedes; an intercessor; a mediator. 

linkman

noun
  • A man who acts as a link or connection. 

  • A presenter who provides the connecting verbiage between a number of separate items in a broadcast. 

  • A player who uses speed and dexterity to keep an attacking team's downfield progress fluid. 

  • An adult linkboy; one bearing a torch or light. 

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