Luzon vs island

Luzon and island both are nouns.

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

Luzon (noun)	island (noun)
the main island of the Philippines	a zone or area resembling an island
	a land mass (smaller than a continent) that is surrounded by water