This is the 15565th most frequent Polish word.
stołach
"Stołach" means "tables" in the locative case in Polish.
The word "stołach" is in Locative plural form referring to 'tables' and indicates the location where books are situated.
Na tych stołach znajdują się różne książki.
On these tables, there are various books.
"Stołach" in this sentence again is in Locative plural to show that the tablecloths are positioned spreading over the tables.
Obrusy na stołach są bardzo kolorowe.
The tablecloths on the tables are very colorful.
Here "stołach" is also Locative plural referring specifically to the wooden tables as the object context of observation.