seller

/ˈsɛlə/noun

A person or business that offers goods or services for sale.

Example sentence

“The seller agreed to lower the price after some negotiation.”

'Bestseller' is the famous compound. A 'seller's market' is one where demand outruns supply, so sellers set the terms.

Related words

buyerSomeone who purchases something.vendorA person or business that sells goods or services.shopperSomeone who is buying, or looking at, things in stores.departmentOne of the sections into which a company, government, or other organization is divided.consumerA person who buys goods or services for their own use.marketplaceThe overall arena of buying, selling, and business activity.