Kyushu vs island

Kyushu and island both are nouns.

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

Kyushu (noun)	island (noun)
the southernmost of the four main islands of Japan; contains coal fields	a zone or area resembling an island
	a land mass (smaller than a continent) that is surrounded by water