Angolan capital vs Luanda

Angolan capital and Luanda both are nouns.

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

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

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

Angolan capital (noun)	Luanda (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