island vs Tahiti

island and Tahiti both are nouns.

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

island (noun)	Tahiti (noun)
a zone or area resembling an island	an island in the south Pacific; the most important island in French Polynesia; made famous by Robert Louis Stevenson and Paul Gauguin
a land mass (smaller than a continent) that is surrounded by water