intermixture vs mixing

intermixture and mixing both are nouns.

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

As nouns, intermixture and mixing are synonyms defined as:

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

intermixture (noun)	mixing (noun)
the act of mixing together	the act of mixing together
an additional ingredient that is added by mixing with the base
any foodstuff made by combining different ingredients