mixed bag vs mixture

mixed bag and mixture both are nouns.

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

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

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

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

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