island vs Culebra

island and Culebra both are nouns.

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

island (noun)	Culebra (noun)
a zone or area resembling an island	a small island off the coast of Puerto Rico with miles of beautiful beaches
a land mass (smaller than a continent) that is surrounded by water