Kalimantan vs island

Kalimantan and island both are nouns.

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

Kalimantan (noun)	island (noun)
3rd largest island in the world; in the western Pacific to the north of Java; largely covered by dense jungle and rain forest; part of the Malay Archipelago	a zone or area resembling an island
the part of Indonesia on the southern side of the island of Borneo	a land mass (smaller than a continent) that is surrounded by water