Atlantic Ocean vs Gulf of Saint Lawrence

Atlantic Ocean and Gulf of Saint Lawrence both are nouns.

Word	Noun	Adjective	Verb	Adverb
Atlantic Ocean	Yes	No	No	No
Gulf of Saint Lawrence	Yes	No	No	No

Atlantic Ocean (noun)	Gulf of Saint Lawrence (noun)
the 2nd largest ocean; separates North and South America on the west from Europe and Africa on the east	an arm of the northwest Atlantic Ocean off the southeastern coast of Canada