Gulf of St. Lawrence vs Atlantic

Gulf of St. Lawrence and Atlantic both are nouns.

Word	Noun	Adjective	Verb	Adverb
Gulf of St. Lawrence	Yes	No	No	No
Atlantic	Yes	Yes	No	No

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

Gulf of St. Lawrence (adjective)	Atlantic (adjective)
	relating to or bordering the Atlantic Ocean