river vs Connecticut River

river and Connecticut River both are nouns.

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

river (noun)	Connecticut River (noun)
a large natural stream of water (larger than a creek)	a river in the northeastern United States; flows south from northern New Hampshire along the border between New Hampshire and Vermont and through Massachusetts and Connecticut where it empties into Long Island Sound