concoction vs premix

concoction and premix both are nouns.

Word	Noun	Adjective	Verb	Adverb
concoction	Yes	No	No	No
premix	Yes	No	No	No

As nouns, premix is a hyponym of concoction; that is, premix is a word with a more specific, narrower meaning than concoction:

Other hyponyms of concoction include mincemeat, dressing, stuffing, roux, batter, dough, mix, filling.

concoction (noun)	premix (noun)
the act of creating something (a medicine or drink or soup etc.) by compounding or mixing a variety of components	a commercially prepared mixture of dry ingredients
the invention of a scheme or story to suit some purpose
an occurrence of an unusual mixture
any foodstuff made by combining different ingredients