intermediary broker intercessor interceder intermediate mediator negotiator middleman arbitrator referee representative medium factor liaison dealer delegate emissary proxy attorney envoy entrepreneur deputy matchmaker messenger conciliator peacemaker interposer buffer agent influence connection fixer frontman link contact linkman arbiter moderator umpire advocate reconciler judge adjudicator facilitator intervenor ref appeaser dove troubleshooter pacifier rep commissary assignee procurator minister spokesperson diplomat ambassador mouthpiece substitute spokeswoman surrogate spokesman negotiant commissioner legate lawyer speaker linesman pacifist holdout maven manager steward peacekeeper courier depute alternate replacement nuncio trustee member nominee interface pleader intervener supplicant petitioner politician haggler intermedium bargainer tactician aide chargé backup executor understudy channel organ