trader

Compared meaning: a person who buys and sells goods (noun).

比较义项：买卖某类商品的人（名词）。

• dealer

  Dealer usually names someone who specializes in one kind of goods and runs a fixed shop or business, often as an authorized seller (a car dealer, an antique dealer).

  dealer 通常指专营某一类商品、经营固定店铺或生意的人，常常是获授权的经销商（如汽车经销商、古董商）。

  She built a loyal customer base as a respected antique dealer in the city.

  作为这座城市里备受尊敬的古董商，她积累了一批忠实顾客。

• trader 本词

  Trader is a broader, more old-fashioned word for anyone who buys and sells goods for profit, without implying a fixed shop or a single specialty, often travelling to markets.

  trader 是更宽泛、较为传统的说法，泛指靠买卖商品获利的人，不强调固定店铺或专营某类商品，常常是四处赶集贩卖。

  The trader loaded his cart with cloth and travelled from town to town.

  这位商人把布匹装上马车，走村串镇地贩卖。

Both mean a person who buys and sells goods for profit. Dealer specializes in one kind of goods with a fixed shop, like a car dealer. Trader is broader, older-sounding, for anyone trading goods without one specialty. Other senses are not compared here.

这两个词都指以买卖商品谋利的人，但语气和典型语境不同：dealer 通常指专营某类商品、有固定门店的商人（如汽车经销商、古董商），而 trader 是更宽泛、较传统的说法，常指四处贩运、不局限于某类商品的商人。这里不比较 dealer 的其它义项（如“毒贩”或纸牌游戏中的“发牌者”），也不比较 trader 的“商船”义项。