Republic of Iraq vs Iraq

Republic of Iraq and Iraq both are nouns.

Word	Noun	Adjective	Verb	Adverb
Republic of Iraq	Yes	No	No	No
Iraq	Yes	No	No	No

As nouns, Republic of Iraq and Iraq are synonyms defined as:

Republic of Iraq and Iraq: a republic in the Middle East in western Asia; the ancient civilization of Mesopotamia was in the area now known as Iraq

Other synonyms of Republic of Iraq include Al-Iraq, Irak.

Republic of Iraq (noun)	Iraq (noun)
a republic in the Middle East in western Asia; the ancient civilization of Mesopotamia was in the area now known as Iraq	a republic in the Middle East in western Asia; the ancient civilization of Mesopotamia was in the area now known as Iraq