dealer

(noun) someone who purchases and maintains an inventory of goods to be sold. Synonyms: trader, bargainer, monger.

(noun) a firm engaged in trading.

(noun) a seller of illicit goods. Examples: "A dealer in stolen goods."

(noun) the major party to a financial transaction at a stock exchange; buys and sells for his own account. Synonyms: principal.

(noun) the person who distributes the playing cards in a card game.