Bahrein Island vs Bahrain Island

Bahrein Island and Bahrain Island both are nouns.

Word	Noun	Adjective	Verb	Adverb
Bahrein Island	Yes	No	No	No
Bahrain Island	Yes	No	No	No

As nouns, Bahrein Island and Bahrain Island are synonyms defined as:

Other synonyms of Bahrein Island include Bahrain, Bahrein.

Bahrein Island (noun)	Bahrain Island (noun)
an island in the Persian Gulf	an island in the Persian Gulf