national capital vs Fort-Lamy

national capital and Fort-Lamy both are nouns.

Word	Noun	Adjective	Verb	Adverb
national capital	Yes	No	No	No
Fort-Lamy	Yes	No	No	No

national capital (noun)	Fort-Lamy (noun)
the capital city of a nation	the capital and largest city of Chad; located in the southwestern on the Shari river