Ruhr vs Ruhr Valley

Ruhr and Ruhr Valley both are nouns.

Word	Noun	Adjective	Verb	Adverb
Ruhr	Yes	No	No	No
Ruhr Valley	Yes	No	No	No

As nouns, Ruhr and Ruhr Valley are synonyms defined as:

Ruhr and Ruhr Valley: a major industrial and coal mining region in the valley of the Ruhr river in northwestern Germany

Ruhr (noun)	Ruhr Valley (noun)
a major industrial and coal mining region in the valley of the Ruhr river in northwestern Germany	a major industrial and coal mining region in the valley of the Ruhr river in northwestern Germany
a tributary of the Rhine