alphabet soup vs mixture

alphabet soup and mixture both are nouns.

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

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

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

alphabet soup (noun)	mixture (noun)
soup that contains small noodles in the shape of letters of the alphabet	the act of mixing together
a confusing assortment	an event that combines things in a mixture
	any foodstuff made by combining different ingredients
	a collection containing a variety of sorts of things
	(chemistry) a substance consisting of two or more substances mixed together (not in fixed proportions and not with chemical bonding)