St. Kitts vs St. Kitts and Nevis

St. Kitts and St. Kitts and Nevis both are nouns.

Word	Noun	Adjective	Verb	Adverb
St. Kitts	Yes	No	No	No
St. Kitts and Nevis	Yes	No	No	No

St. Kitts (noun)	St. Kitts and Nevis (noun)
the largest of the islands comprising Saint Christopher-Nevis	a country on several of the Leeward Islands; located to the east southeast of Puerto Rico; achieved independence from the United Kingdom in 1983