Guadalcanal vs island

Guadalcanal and island both are nouns.

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

Guadalcanal (noun)	island (noun)
a battle in World War II in the Pacific (1942-1943); the island was occupied by the Japanese and later recaptured by American forces	a zone or area resembling an island
a mountainous island; the largest of the Solomon Islands in the independent state that is a member of the British Commonwealth	a land mass (smaller than a continent) that is surrounded by water