St. Lawrence River vs United States of America

St. Lawrence River and United States of America both are nouns.

Word	Noun	Adjective	Verb	Adverb
St. Lawrence River	Yes	No	No	No
United States of America	Yes	No	No	No

St. Lawrence River (noun)	United States of America (noun)
a North American river; flows into the Gulf of Saint Lawrence and the North Atlantic	North American republic containing 50 states - 48 conterminous states in North America plus Alaska in northwest North America and the Hawaiian Islands in the Pacific Ocean; achieved independence in 1776