This is the 13860th most frequent Polish word.
polsko
"Polsko" in English means "Poland."
Here, 'Polsko' is used directly as a vocative case addressing Poland as a personified entity.
Polsko, ty jesteś moją ojczyzną.
Poland, you are my homeland.
In this sentence, 'Polsko' is used as the primary subject in the nominative case referring to the country.
Polsko ma bogatą historię.
Poland has a rich history.
In this example, 'Polsko' is used in the accusative case as the direct object of the verb indicating the country to be visited.