Islamic State of Afghanistan vs capital of Afghanistan

Islamic State of Afghanistan and capital of Afghanistan both are nouns.

Word	Noun	Adjective	Verb	Adverb
Islamic State of Afghanistan	Yes	No	No	No
capital of Afghanistan	Yes	No	No	No

Islamic State of Afghanistan (noun)	capital of Afghanistan (noun)
a mountainous landlocked country in central Asia; bordered by Iran to the west and Russia to the north and Pakistan to the east and south	the capital and largest city of Afghanistan; located in eastern Afghanistan