seller, marketer, vender, vendor, trafficker

someone who promotes or exchanges goods or services for money

• ticket agent, booking clerk — someone who sells tickets (e.g., theater seats or travel accommodations)
• cosmetician — someone who sells or applies cosmetics
• flower girl — a woman who sells flowers in the street
• fruiterer — (British) a person who sells fruit
• huckster, cheap-jack — a seller of shoddy goods
• peddler, pedlar, packman, hawker, pitchman — someone who travels about selling his wares (as on the streets or at carnivals)
• selling agent — someone who sells goods (on commission) for others
• dealer — a seller of illicit goods
• underseller — a seller that sells at a lower price than others do

• merchant, merchandiser — a businessperson engaged in retail trade