Manhattan Island vs New York

Manhattan Island and New York both are nouns.

Word	Noun	Adjective	Verb	Adverb
Manhattan Island	Yes	No	No	No
New York	Yes	No	No	No

Manhattan Island (noun)	New York (noun)
an island at the north end of New York Bay where the borough of Manhattan is located	a Mid-Atlantic state; one of the original 13 colonies, with capital Albany
	the largest city in New York State and in the United States; located in southeastern New York at the mouth of the Hudson river; a major financial and cultural center
	one of the British colonies that formed the United States, with capital New York City