Actually, Starabucks is a coffee brand! And Dunkin Donuts started out as a Donut Shop but is better known now for its coffee than for its donuts, so both might be considered on the same madreigah. The fact that they also serve other products besides coffee does not take away the “ikar” that they are coffee houses.
Most fruit stores also sell nosh and some refrigerated products but we don’t rename them grocery stores, they are still fruit stores because their “ikar” is still fruit.