capital of Oklahoma vs Oklahoma City

capital of Oklahoma and Oklahoma City both are nouns.

Word	Noun	Adjective	Verb	Adverb
capital of Oklahoma	Yes	No	No	No
Oklahoma City	Yes	No	No	No

As nouns, capital of Oklahoma and Oklahoma City are synonyms defined as:

capital of Oklahoma and Oklahoma City: capital and largest city of Oklahoma; the economy is based on oil and livestock

capital of Oklahoma (noun)	Oklahoma City (noun)
capital and largest city of Oklahoma; the economy is based on oil and livestock	capital and largest city of Oklahoma; the economy is based on oil and livestock