Honolulu vs Hawaiian capital

Honolulu and Hawaiian capital both are nouns.

Word	Noun	Adjective	Verb	Adverb
Honolulu	Yes	No	No	No
Hawaiian capital	Yes	No	No	No

As nouns, Honolulu and Hawaiian capital are synonyms defined as:

Honolulu and Hawaiian capital: the capital and largest city of Hawaii; located on a large bay on the island of Oahu

Other synonyms of Honolulu include capital of Hawaii.

Honolulu (noun)	Hawaiian capital (noun)
the capital and largest city of Hawaii; located on a large bay on the island of Oahu	the capital and largest city of Hawaii; located on a large bay on the island of Oahu