Ware is a particular type of item — luster ware is a kind of ceramic with a shiny metallic finish. Fiesta ware is a brand of colorful tabletop china that first became popular in the 1930s.
The word shows up as a suffix, too — software, silverware, dinnerware — where it means articles of the same type or within the same category. A warehouse is a place where goods or raw materials are stored. When the word's plural, it means merchandise — when you display your wares in your shop, you're showing what you've got for sale.