This is the 606th most frequent Polish word.
częstochowa
Częstochowa is a city in southern Poland, known for the Jasna Góra Monastery and the Black Madonna icon.
In this sentence, 'częstochowa' is used as a proper noun, referring to the city's name.
Częstochowa jest pięknym miastem w Polsce.
Częstochowa is a beautiful city in Poland.
Here, 'częstochowa' is used in its locative form 'Częstochowę,' indicating the grammatical case used when referring to going to the city.
Moja babcia często odwiedza Częstochowę, bo jest bardzo religijna.
My grandmother often visits Częstochowa because she is very religious.
In this sentence, 'częstochowa' is used in the nominative case to describe the subject and its famous attributes.