alphabet soup vs smorgasbord

alphabet soup and smorgasbord both are nouns.

Word	Noun	Adjective	Verb	Adverb
alphabet soup	Yes	No	No	No
smorgasbord	Yes	No	No	No

As nouns, smorgasbord is a hypernym of alphabet soup; that is, smorgasbord is a word with a broader meaning than alphabet soup:

Other hypernyms of alphabet soup include assortment, miscellanea, miscellany, mixed bag, mixture, motley, potpourri, salmagundi, variety.

alphabet soup (noun)	smorgasbord (noun)
soup that contains small noodles in the shape of letters of the alphabet	an assortment of foods starting with herring or smoked eel or salmon etc with bread and butter; then cheeses and eggs and pickled vegetables and aspics; finally hot foods; served as a buffet meal
a confusing assortment	a collection containing a variety of sorts of things