Anguilla vs island

Anguilla and island both are nouns.

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

Anguilla (noun)	island (noun)
type genus of the Anguillidae: eels	a zone or area resembling an island
a British colony in the West Indies	a land mass (smaller than a continent) that is surrounded by water