You have to provide pupils some flash cards or pieces of paper fort his activity. Pupils can write down a word from the topic on each card. On the other side of the card pupils can write the definitions. Another possibility is to write the definitions on another card. Pupils can play a match exercise themselves when they mix up all the cards (words and definitions) on their desks. Pupils can check each other when they pile up the cards and ask ech other about the words or definitions.