agent
arbitrator
broker
bummaree
butty
chandler
commoner
connection
contact
dealer
deputy
distributor
entrepreneur
front
front man
go-between
grocer
importer
interagent
interceder
intercessor
intermediary
intermediate
intermediate agent
intermediator
intermedium
internuncio
interpleader
intervener
interventionist
interventor
jobber
liaison
link
marketer
mediary
mediator
medium
merchandiser
merchant
monger
mouthpiece
negotiant
negotiator
negotiatress
negotiatrix
minstrel
representative
bowline
consignor
speculator