Samoa vs island

Samoa and island both are nouns.

Word	Noun	Adjective	Verb	Adverb
Samoa	Yes	No	No	No
island	Yes	No	No	No

Samoa (noun)	island (noun)
a constitutional monarchy on the western part of the islands of Samoa in the South Pacific	a zone or area resembling an island
a group of volcanic islands in the South Pacific midway between Hawaii and Australia; its climate and scenery and Polynesian culture make it a popular tourist stop	a land mass (smaller than a continent) that is surrounded by water