river vs St. Lawrence River

river and St. Lawrence River both are nouns.

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

river (noun)	St. Lawrence River (noun)
a large natural stream of water (larger than a creek)	a North American river; flows into the Gulf of Saint Lawrence and the North Atlantic