river vs Magdalena River

river and Magdalena River both are nouns.

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

river (noun)	Magdalena River (noun)
a large natural stream of water (larger than a creek)	a river that rises in the Andes mountains in southwestern Colombia and flows generally northward to empty into the Caribbean Sea at Barranquilla