noun
capital city
Refers to the capital city of a country or region. Often used in formal or official contexts, similar to 首都 but can emphasize the city itself rather than the metropolitan area.
ワシントンD.C.はアメリカの首府です。
Washington, D.C. is the capital of the United States.
その州の首府は小さな町にある。
The state capital is in a small town.