This is the 611th most frequent Catalan word.
torna
"Change" (money returned after a purchase) or "return."
Here, 'torna' is used as a verb meaning 'to return' or 'to go back' in the context of coming back to a place.
Ell torna a casa després de la feina.
He returns home after work.
In this case, 'tornen' is used as a verb conjugated in plural, meaning 'to return' something, specifically referring to returning money.
Si no estàs satisfet, pots demanar que et tornen els diners.
If you are not satisfied, you can ask for the money to be returned to you.
Here, 'torna' is used as a noun meaning 'turn' or 'chance' within the game's rules.