This is the 1769th most frequent Polish word.
więźniów
"Więźniów" means "prisoners" in English.
The word "więźniów" is used as the genitive plural form of "więzień" (prisoner) to indicate a quantity (more prisoners).
Więźniów w tym więzieniu jest więcej niż w innym.
There are more prisoners in this prison than in the other.
Here, "więźniów" is in the genitive plural form to show possession or associated rights (prisoners' rights).
Prawa więźniów są chronione przez prawo międzynarodowe.
The rights of the prisoners are protected by international law.
In this case, "więźniów" describes a group in the genitive plural form, typically used after a noun indicating a set or group.