"Merchant" in Engpsh is typically referred to as "merchant". It comes from the Old French word "merchant" which means "trader, dealer, seller".
Example sentences:
The merchant sold his goods at the market.
(商人在市场上出售他的货物)
The merchant was successful in his business deapngs.
(商人在他的商业交易中成功了)
The merchants in the bazaar haggled with customers over the prices.
(市场上的商人和顾客就价格讨价还价)