Iraq vs Republic of Iraq

Iraq and Republic of Iraq both are nouns.

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

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

Iraq and Republic of 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 Iraq include Al-Iraq, Irak.

Iraq (noun)	Republic of 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