Country: a nation with its own government, occupying a particular territory.
Capital: the most important city or town of a country or region, usually its seat of government and administrative centre.
Flag: a piece of cloth or similar material, typically oblong or square, attachable by one edge to a pole or rope and used as the symbol or emblem of a country or institution.
Population: all the inhabitants of a particular town, area, or country.
Currency: a system of money in general use in a particular country or area.