St. Kitts vs Saint Christopher

St. Kitts and Saint Christopher both are nouns.

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

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

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

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

St. Kitts (noun)	Saint Christopher (noun)
the largest of the islands comprising Saint Christopher-Nevis	the largest of the islands comprising Saint Christopher-Nevis
	Christian martyr and patron saint of travellers (3rd century)