seller(n = noun.person) marketer, trafficker, vender, vendor - someone who promotes or exchanges goods or services for money;
is a kind of merchandiser, merchant
has particulars: booking clerk, ticket agent, cosmetician, flower girl, fruiterer, cheap-jack, huckster, hawker, packman, peddler, pedlar, pitchman, selling agent, dealer, underseller
Derived forms verb sell₁, verb sell₄

   One who sells. Chaucer. [1913 Webster]

seller, n.
1 a person who sells.
2 a commodity that sells well or badly.

Idiom:
seller's (or sellers') market an economic position in which goods are scarce and expensive.

N  sale, vent, disposal, auction, roup, Dutch auction, outcry, vendue, custom, vendibility, vendibleness, seller, vender, vendor, merchant, auctioneer, under the hammer, on the market, for sale, salable, marketable, vendible, unsalable unpurchased, unbought, on one's hands, chose qui plait est a demi vendue.

N  merchant, trader, dealer, monger, chandler, salesman, changer, regrater, shopkeeper, shopman, tradesman, tradespeople, tradesfolk, retailer, chapman, hawker, huckster, higgler, pedlar, colporteur, cadger, Autolycus, sutler, vivandiere, costerman, costermonger, tallyman, camelot, faker, vintner, money broker, money changer, money lender, cambist, usurer, moneyer, banker, jobber, broker, buyer, seller, bear, bull, concern, firm.

best seller, book seller, print seller, stationery seller