This is the 93rd most frequent Japanese word.
中国
"China."
In this case, '中国' is part of a compound noun to refer to 'Chinatown', an area usually associated with Chinese communities in a city.
この公園は都市の中国地区にある。
This park is located in the city's Chinatown.
In this sentence, '中国' is used as a proper noun to refer to the country 'China'.
私の友人は中国に留学しています。
My friend is studying abroad in China.
Here, '中国' is used as an attributive noun to describe the culture associated with China.