noun (n)

• someone who purchases and maintains an inventory of goods to be sold(noun.person)

  Synonym:
  bargainer, monger, trader
  

  source: wordnet30
• a firm engaged in trading(noun.group)

  source: wordnet30
• a seller of illicit goods(noun.person)

  Example:
  A dealer in stolen goods.
  

  source: wordnet30
• the major party to a financial transaction at a stock exchange; buys and sells for his own account(noun.person)

  Synonym:
  principal
  

  source: wordnet30
• the person who distributes the playing cards in a card game(noun.person)

  source: wordnet30
• One who deals; one who has to do, or has concern, with others; esp., a trader, a trafficker, a shopkeeper, a broker, or a merchant; as, a dealer in dry goods; a dealer in stocks; a retail dealer.(noun)

  source: webster1913