confusion vs mix-up

confusion and mix-up both are nouns.

Word	Noun	Adjective	Verb	Adverb
confusion	Yes	No	No	No
mix-up	Yes	No	No	No

As nouns, confusion and mix-up are synonyms defined as:

confusion and mix-up: a mistake that results from taking one thing to be another

confusion (noun)	mix-up (noun)
a mistake that results from taking one thing to be another	a mistake that results from taking one thing to be another
an act causing a disorderly combination of elements with identities lost and distinctions blended
a mental state characterized by a lack of clear and orderly thought and behavior
a feeling of embarrassment that leaves you confused
disorder resulting from a failure to behave predictably