This is the 16598th most frequent Polish word.
worków
"Worków" means "bags" or "sacks" (genitive plural form) in English.
Here, "worków" is the plural genitive form of the word "worek" and is used to indicate possession or association, essentially "of the sacks."
Wyjęliśmy ziemniaki z worków.
We took potatoes out of the sacks.
In this sentence, "worków" functions as the plural genitive form, showing that the number of an item, in this case sand, is in relation to sacks.
Zabrakło worków na piasek.
There weren't enough sacks for sand.
In this usage, "worków" again acts as the plural genitive form to specify the sacks containing grain.