Taboo is a simple game for reviewing vocabulary which can work with students at almost any level, and with any size of class. For preparation, simply select the words that you want to review from one or more recent lessons, write them on slips of paper and put them in a small box or bag.
Divide the class into two teams. One student takes a word from the bag, and has to enable his / her team-mates to understand what the word is. (S)he can use definitions, examples,or any other techniques - the only thing that's not allowed is to say the actual word. If the team finds the word, they get a point.
You can set a time limit for each turn to keep up the pace of the activity, so this is a useful way to reinforce recently-learned vocabulary without taking up too much time in the lesson.