Ellis Island vs island

Ellis Island and island both are nouns.

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

Ellis Island (noun)	island (noun)
an island in New York Bay that was formerly the principal immigration station for the United States	a zone or area resembling an island
	a land mass (smaller than a continent) that is surrounded by water