mixture vs mixed bag

mixture and mixed bag both are nouns.

Word	Noun	Adjective	Verb	Adverb
mixture	Yes	No	No	No
mixed bag	Yes	No	No	No

As nouns, mixture and mixed bag are synonyms defined as:

mixture and mixed bag: a collection containing a variety of sorts of things

Other synonyms of mixture include assortment, miscellanea, miscellany, motley, potpourri, salmagundi, smorgasbord, variety.

mixture (noun)	mixed bag (noun)
the act of mixing together	a collection containing a variety of sorts of things
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)