中国【ちゅうごく】
China, Chūgoku region (western part of Honshu comprising the prefectures of Okayama, Hiroshima, Yamaguchi, Tottori and Shimane), central part of a country, main region, province of the second lowest rank (ritsuryō system)
韓国【かんこく】
South Korea, Republic of Korea, Korean Empire (1897-1910)
国民【こくみん】
people (of a country), nation, citizen, national, Democratic Party for the People
米国【べいこく】
(United States of) America, USA, US
天国【てんごく】
paradise, heaven, Kingdom of Heaven
国家【こっか】
state, country, nation
王国【おうこく】
kingdom, monarchy
全国【ぜんこく】
the whole country
国民【くにたみ】
people of a country
帝国【ていこく】
empire, imperial
国王【こくおう】
king, queen, monarch, sovereign, the Crown (as a focus of authority in the UK, etc.), the throne
英国【えいこく】
United Kingdom, Britain, Great Britain
帰国【きこく】
return to one's country, return to one's hometown
国境【こっきょう】
border (between countries), national border
両国【りょうこく】
both countries, Ryōgoku (area of Tokyo)
国連【こくれん】
United Nations, UN
国会【こっかい】
National Diet, legislative assembly of Japan (1947-), Imperial Diet, legislative assembly of Japan (1889-1947), legislative assembly, parliament, congress
グアテマラ共和国【グアテマラきょうわこく】
Republic of Guatemala
同国【どうこく】
same country, same province, the (said) country
国籍【こくせき】
nationality, citizenship, nationality (ship, airplane, etc.), registration, flag