odds and ends vs mixture

odds and ends and mixture both are nouns.

Word	Noun	Adjective	Verb	Adverb
odds and ends	Yes	No	No	No
mixture	Yes	No	No	No

As nouns, mixture is a hypernym of odds and ends; that is, mixture is a word with a broader meaning than odds and ends:

Other hypernyms of odds and ends include assortment, miscellanea, miscellany, mixed bag, motley, potpourri, salmagundi, smorgasbord, variety.

odds and ends (noun)	mixture (noun)
a motley assortment 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)