Here's the breakdown:
* Smorgasbord: This word is of Swedish origin and refers to a buffet-style meal featuring a variety of cold and hot dishes.
* Buttered open-faced sandwich table: This describes a specific type of food item and a way it is served.
While a smorgasbord might include open-faced sandwiches, it's not the sole focus, nor does the word "smorgasbord" itself specifically imply buttered sandwiches.