Bahrein vs Bahrain Island

Bahrein and Bahrain Island both are nouns.

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

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

Other synonyms of Bahrein include Bahrain, Bahrein Island.

Bahrein (noun)	Bahrain Island (noun)
an island country in the Persian Gulf off the coast of Saudi Arabia; oil revenues funded progressive programs until reserves were exhausted in 1970s	an island in the Persian Gulf
an island in the Persian Gulf