Gulf States vs Islamic Republic of Iran

Gulf States and Islamic Republic of Iran both are nouns.

Word	Noun	Adjective	Verb	Adverb
Gulf States	Yes	No	No	No
Islamic Republic of Iran	Yes	No	No	No

Gulf States (noun)	Islamic Republic of Iran (noun)
a region of the United States comprising states bordering the Gulf of Mexico; Alabama and Florida and Louisiana and Mississippi and Texas	a theocratic Islamic republic in the Middle East in western Asia; Iran was the core of the ancient empire that was known as Persia until 1935; rich in oil
the countries in southwestern Asia that border the Persian Gulf