island vs GU

island and GU both are nouns.

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

island (noun)	GU (noun)
a zone or area resembling an island	the largest and southernmost island in the Marianas which is administered as a territory of the United States; it was ceded by Spain to the United States in 1898
a land mass (smaller than a continent) that is surrounded by water

island (adjective)	GU (adjective)
	of or related to the genital and urinary organs or their functions