St. Lawrence River vs Saint Lawrence River

St. Lawrence River and Saint Lawrence River both are nouns.

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

As nouns, St. Lawrence River and Saint Lawrence River are synonyms defined as:

St. Lawrence River and Saint Lawrence River: a North American river; flows into the Gulf of Saint Lawrence and the North Atlantic

Other synonyms of St. Lawrence River include Saint Lawrence, St. Lawrence.

St. Lawrence River (noun)	Saint Lawrence River (noun)
a North American river; flows into the Gulf of Saint Lawrence and the North Atlantic	a North American river; flows into the Gulf of Saint Lawrence and the North Atlantic