mix vs admix

mix is a noun but admix is not a noun.

Word	Noun	Adjective	Verb	Adverb
mix	Yes	No	Yes	No
admix	No	No	Yes	No

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

mix (noun)	admix (noun)
the act of mixing together
an event that combines things in a mixture
a commercially prepared mixture of dry ingredients

mix (verb)	admix (verb)
mix together different elements	mix or mingle
add as an additional element or part
combine (electronic signals)
to bring or combine together or with something else
mix so as to make a random order or arrangement
open (a place) to members of all races and ethnic groups