vendor

Compared meaning: a person or machine that sells things (noun).

比较义项：卖东西的人（或机器）（名词）。

• seller

  Seller is the plain, all-purpose word for whoever sells something, from a company to an individual; it is the everyday choice for online marketplaces and general trade, with no hint of a stall or machine.

  卖家（seller）是最普通、通用的说法，指出售商品的人或公司，从公司到个人都可以用；是网络交易和一般贸易中最常用的说法，不带摊位或机器的含义。

  The online seller refunded my money within a day of the complaint.

  这位网店卖家在我投诉后一天内就退了款。

• vendor 本词

  Vendor usually suggests a small-scale seller with a stall or cart, such as a street vendor, or a machine that dispenses goods, like a vending machine; it sounds more specific and slightly more formal than seller.

  vendor通常指有摊位或推车的小规模卖家，例如街头小贩（street vendor），或指自动售货一类的机器；比seller听起来更具体，语气也略显正式。

  A vendor sold fresh fruit near the train station.

  一个小贩在火车站附近卖新鲜水果。

Seller and vendor are close here, but seller is general and neutral, for a company or a person. Vendor suggests a specific form, like a street stall or a vending machine, and sounds more formal. The 'supplier' sense of vendor is not compared here.

这两个词在表示“卖东西的人”时意思相近，但seller更笼统中性，公司或个人都能用；vendor更强调街头摊贩或自动售货机等具体形式，语气略正式。这里不比较vendor在商业合同中指“供应商”的用法。