western vs west-central

western is a noun but west-central is not a noun.

Word	Noun	Adjective	Verb	Adverb
western	Yes	Yes	No	No
west-central	No	Yes	No	No

western (noun)	west-central (noun)
a sandwich made from a western omelet

western (adjective)	west-central (adjective)
relating to or characteristic of the western parts of the world or the West as opposed to the eastern or oriental parts	of a region of the United States usually including Colorado, Nevada, Utah
of or characteristic of regions of the United States west of the Mississippi River
lying toward or situated in the west
of wind; from the west