river vs Scheldt River

river and Scheldt River both are nouns.

Word	Noun	Adjective	Verb	Adverb
river	Yes	No	No	No
Scheldt River	Yes	No	No	No

river (noun)	Scheldt River (noun)
a large natural stream of water (larger than a creek)	a river that rises in France and flows northeast across Belgium and empties into the North Sea