Santa Catalina vs island

Santa Catalina and island both are nouns.

Word	Noun	Adjective	Verb	Adverb
Santa Catalina	Yes	No	No	No
island	Yes	No	No	No

Santa Catalina (noun)	island (noun)
an island resort in the Pacific off the southwestern coast of California	a zone or area resembling an island
	a land mass (smaller than a continent) that is surrounded by water