Cellar is a room for storage, usually below ground or beneath a building: “At the end of the summer, she had 1,000 containers of food stored in the cellar to feed her family through the winter.”
Slang meaning: Cellar means the last place or lowest level, especially in competitive standings: The team came from the cellar to win the cup.
Seller, as we all know, means someone who exchanges a product or service for money; a vendor.