river vs Wabash River

river and Wabash River both are nouns.

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

river (noun)	Wabash River (noun)
a large natural stream of water (larger than a creek)	a tributary of the Ohio River that rises in western Ohio and flows southwestward across Indiana