Divide the group into two teams. Explain that they are cowboys and they are involved in a duel.
One student from each team comes to the front. Get them to pretend to draw their pistols. Say "how do you say..." and a word in their mother tongue.
The first child to give the answer and then "bang bang", pretending to shoot his opponent is the winner. He remains standing and the other one sits down. I give 1 point for the right answer and 5 extra points if they manage to "kill" 4 opponents in a row.
Editor's Note: Instead of saying the word in the students' mother tongue, it would be possible to use a picture or to say a definition ("What do you call the large gray animal with a long nose?")