"Boom" - A vocabulary class game

Preparation.
In pieces of paper write words which the students already know from their vocabulary courses. 
Fold the papers in half.  Also, add some cards that say; “BOOM!”.

Game in class.
 Form small groups of pupils. Each one will consist at least of 2 students. Each one of the groups picks up cards and if they spell the word correctly, they keep the card and they get 1 point. 

If they draw a “BOOM!” card they yell “BOOM!”, 
they return all the cards and they lose 1 point. 

The team with the most points wins and takes 2 stickers.