admixture vs mixing

admixture and mixing both are nouns.

Word	Noun	Adjective	Verb	Adverb
admixture	Yes	No	No	No
mixing	Yes	No	No	No

As nouns, admixture and mixing are synonyms defined as:

Other synonyms of admixture include commixture, intermixture, mix, mixture.

admixture (noun)	mixing (noun)
the act of mixing together	the act of mixing together
an additional ingredient that is added by mixing with the base
the state of impairing the quality or reducing the value of something