Canadian River vs river

Canadian River and river both are nouns.

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

Canadian River (noun)	river (noun)
a river rising in northeastern New Mexico and flowing eastward across the Texas panhandle to become a tributary of the Arkansas River in Oklahoma	a large natural stream of water (larger than a creek)