Saint Vincent vs St. Vincent and the Grenadines

Saint Vincent and St. Vincent and the Grenadines both are nouns.

Word	Noun	Adjective	Verb	Adverb
Saint Vincent	Yes	No	No	No
St. Vincent and the Grenadines	Yes	No	No	No

Saint Vincent (noun)	St. Vincent and the Grenadines (noun)
an island in the center of the Windward Islands; the largest of the islands comprising Saint Vincent and the Grenadines	an island country in the central Windward Islands; achieved independence from the United Kingdom in 1979