This is the 3690th most frequent Polish word.
katowice
Katowice: A city in southern Poland, part of the Upper Silesian region.
In this sentence, 'Katowice' is used as a proper noun referring to a specific location, which is a city in Poland.
Katowice są dużym miastem na Śląsku.
Katowice is a large city in Upper Silesia.
Here, 'Katowice' is also used as a proper noun, functioning as the destination of the action in the dative case.
Wyjeżdżam na konferencję do Katowic.
I am traveling to a conference in Katowice.
In this sentence, 'Katowic' is the genitive case of 'Katowice', used to indicate possession.