concoction vs roux

concoction and roux both are nouns.

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

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

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

concoction (noun)	roux (noun)
the act of creating something (a medicine or drink or soup etc.) by compounding or mixing a variety of components	a mixture of fat and flour heated and used as a basis for sauces
the invention of a scheme or story to suit some purpose
an occurrence of an unusual mixture
any foodstuff made by combining different ingredients