Saint Lawrence River vs US

Saint Lawrence River and US both are nouns.

Word	Noun	Adjective	Verb	Adverb
Saint Lawrence River	Yes	No	No	No
US	Yes	No	No	No

Saint Lawrence River (noun)	US (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