intercessor (n.)

• advocate
• agent
• attorney
• barrister
• connection
• counsel
• counselor
• counselor-at-law
• deputy
• entrepreneur
• front
• go-between
• intermediary
• intermediate
• intermediator
• intermedium
• internuncio
• lawyer
• mediator
• medium
• middleman
• mouthpiece
• negotiant
• negotiator
• negotiatress
• negotiatrix
• ombudsman
• pleader
• proctor
• procurator
• solicitor
• spokesman
• spokeswoman