island vs Saipan

island and Saipan both are nouns.

Word	Noun	Adjective	Verb	Adverb
island	Yes	No	No	No
Saipan	Yes	No	No	No

island (noun)	Saipan (noun)
a zone or area resembling an island	US forces captured the island from the Japanese in July 1944; it was an important air base until the end of World War II
a land mass (smaller than a continent) that is surrounded by water	the largest island in the Northern Marianas and the administrative center of the commonwealth of the Northern Mariana Islands in union with the United States