seller

/ˈsɛlər/
noun
  1. A person or business that sells something.
    • As a seller on the online marketplace, she ships products worldwide.
    • The car seller provided a detailed history of the vehicle.
    • The seller offered a discount on the last few items.
  2. A product that sells in a particular way (usually with a modifier like 'good seller' or 'best seller').
    • That model of phone is a poor seller compared to its competitors.
    • This novel was a top seller for months after its release.
    • The bakery's cinnamon rolls are always a fast seller in the morning.