This is the 11005th most frequent Polish word.
festynów
"Festynów" means "festivals" or "fetes" in English.
The word 'festynów' is here the genitive plural form of 'festyn', indicating activities of or relating to festivals held during holidays.
Uczestniczyliśmy w wielu festynach podczas wakacji.
We participated in many festivals during the holidays.
The word 'festynów' here is again the genitive plural form, indicating the ones that are organizing these festivals.
Organizatorzy festynów zapraszają wszystkich mieszkańców.
The organizers of the festivals invite all residents.
In this sentence, 'festynów' is in the genitive plural form, used to describe the possession or characteristic of the festivals.