river vs River Adige

river and River Adige both are nouns.

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

river (noun)	River Adige (noun)
a large natural stream of water (larger than a creek)	a river in northern Italy that flows southeast into the Adriatic Sea