Ruhr Valley vs Ruhr

Ruhr Valley and Ruhr both are nouns.

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

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

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

Ruhr Valley (noun)	Ruhr (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