St. Kitts vs Saint Kitts

St. Kitts and Saint Kitts both are nouns.

Word	Noun	Adjective	Verb	Adverb
St. Kitts	Yes	No	No	No
Saint Kitts	Yes	No	No	No

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

St. Kitts and Saint Kitts: the largest of the islands comprising Saint Christopher-Nevis

Other synonyms of St. Kitts include Saint Christopher, St. Christopher.

St. Kitts (noun)	Saint Kitts (noun)
the largest of the islands comprising Saint Christopher-Nevis	the largest of the islands comprising Saint Christopher-Nevis