Trent River vs river

Trent River and river both are nouns.

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

Trent River (noun)	river (noun)
a river in central England that flows generally northeastward to join with the Ouse River and form the Humber	a large natural stream of water (larger than a creek)