This is the 12th most frequent Persian word.
کشور
Country.
Here, 'کشور' means 'country' and is used as a noun representing a nation.
کشور ایران یکی از قدیمیترین فرهنگها را دارد.
The country of Iran has one of the oldest cultures.
In this sentence, 'کشور' is used in its plural form 'کشورها' to denote multiple countries.
ما برای یادگیری زبان به کشورهای مختلف سفر میکنیم.
We travel to different countries to learn languages.
Here, 'کشور' is used metaphorically to denote the concept of a nation as a collective entity.