island vs Channel Island

island and Channel Island both are nouns.

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

island (noun)	Channel Island (noun)
a zone or area resembling an island	any of a group of British islands in the English Channel off the northern coast of France
a land mass (smaller than a continent) that is surrounded by water