St. Francis River vs river

St. Francis River and river both are nouns.

Word	Noun	Adjective	Verb	Adverb
St. Francis River	Yes	No	No	No
river	Yes	No	No	No

St. Francis River (noun)	river (noun)
a tributary of the Mississippi River that rises in Missouri and flows southeastward through Arkansas	a large natural stream of water (larger than a creek)