An auctioner. As in, a person who works at an Auction.
A person who sells goods is commonly referred to as a "merchant" or a "vendor." Other terms that may be used include "retailer," "shopkeeper," or "seller." The specific title can depend on the nature of the business and the context in which the individual is selling goods.
Such people are drapers, clothiers, cloth merchants, or dry goods merchants.
A wholesaler.
An author is a person who writes and sells books.
The person who sells drink is known as sellsmen
diplomat
An immigrant.
baker
A person who sells books is commonly referred to as a bookseller or a book vendor.
You call a person who sells flowers a (Florist)
A person who sells ship supplies is called a chandler