assemble vs mix up

assemble and mix up both are verbs.

Word	Noun	Adjective	Verb	Adverb
assemble	No	No	Yes	No
mix up	No	No	Yes	No

As verbs, mix up is a hyponym of assemble; that is, mix up is a word with a more specific, narrower meaning than assemble:

Other hyponyms of assemble include comfit, confect, confection, confuse, jumble, reassemble, configure, compound, rig up.

assemble (verb)	mix up (verb)
create by putting components or members together	cause to be perplexed or confounded
collect in one place	assemble without order or sense
get people together