island vs Anglesea Island

island and Anglesea Island both are nouns.

Word	Noun	Adjective	Verb	Adverb
island	Yes	No	No	No
Anglesea Island	Yes	No	No	No

island (noun)	Anglesea Island (noun)
a zone or area resembling an island	an island to the northwest of Wales
a land mass (smaller than a continent) that is surrounded by water