Hawaiian capital vs Honolulu

Hawaiian capital and Honolulu both are nouns.

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

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

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

Other synonyms of Hawaiian capital include capital of Hawaii.

Hawaiian capital (noun)	Honolulu (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