Nouns

(n)trader, bargainer, dealer, mongersomeone who purchases and maintains an inventory of goods to be sold
(n)dealera firm engaged in trading
(n)dealera seller of illicit goods“a dealer in stolen goods”
(n)principal, dealerthe major party to a financial transaction at a stock exchange; buys and sells for their own account
(n)dealerthe person who distributes the playing cards in a card game