Luanda vs Angolan capital

Luanda and Angolan capital both are nouns.

Word	Noun	Adjective	Verb	Adverb
Luanda	Yes	No	No	No
Angolan capital	Yes	No	No	No

As nouns, Luanda and Angolan capital are synonyms defined as:

Luanda and Angolan capital: port city on Atlantic coast; the capital and largest city of Angola

Luanda (noun)	Angolan capital (noun)
port city on Atlantic coast; the capital and largest city of Angola	port city on Atlantic coast; the capital and largest city of Angola