Saint John River vs Pine Tree State

Saint John River and Pine Tree State both are nouns.

Word	Noun	Adjective	Verb	Adverb
Saint John River	Yes	No	No	No
Pine Tree State	Yes	No	No	No

Saint John River (noun)	Pine Tree State (noun)
a river that rises in Maine and flows northeastward through New Brunswick to empty into the Bay of Fundy	a state in New England with capital Augusta