This is the 3880th most frequent Polish word.
puławy
"Puławy" is a proper noun referring to a town in eastern Poland.
Here, 'Puławy' is used as a proper noun denoting a specific place.
Puławy są pięknym miastem w Polsce.
Puławy is a beautiful city in Poland.
In this sentence, 'Puławy' is the name of the location where the event (spending the weekend) occurred.
Spędziliśmy weekend w Puławach, zwiedzając ich most na Wiśle.
We spent the weekend in Puławy, visiting its bridge over the Vistula.
'Puławy' here represents the subject of the sentence, referring again to the city whose history is being described.