national capital vs Mogadishu

national capital and Mogadishu both are nouns.

Word	Noun	Adjective	Verb	Adverb
national capital	Yes	No	No	No
Mogadishu	Yes	No	No	No

national capital (noun)	Mogadishu (noun)
the capital city of a nation	the capital and largest city of Somalia; a port on the Indian Ocean