Olympia vs capital of Washington

Olympia and capital of Washington both are nouns.

Word	Noun	Adjective	Verb	Adverb
Olympia	Yes	No	No	No
capital of Washington	Yes	No	No	No

As nouns, Olympia and capital of Washington are synonyms defined as:

Olympia and capital of Washington: capital of the state of Washington; located in western Washington on Puget Sound

Olympia (noun)	capital of Washington (noun)
capital of the state of Washington; located in western Washington on Puget Sound	capital of the state of Washington; located in western Washington on Puget Sound
a plain in Greece in the northwestern Peloponnese; the chief sanctuary of Zeus and the site of the original Olympian Games