What is another word for "commissary"?

Roget's Thesaurus (1911) lists these synonyms for "commissary": advocate, against, agent, aid, ambassador, arbitrator, arm, attache, attorney, auctioneer, back, bagman, bailiff, batman, beat, broker, business, cater, caterer, charge, clerk, commercial, commissariat, commission, commissionaire, commissioner, committee, comprador, consignee, consul, corps, correspondent, curator, day, delegate, deputy, diplomat, diplomate, diplomatist, director.