Allow students a minute or so to write down as many appropriate words as they can. The teacher should also write ONE word belonging to the chosen category. Then students take turns to read one of their words at a time. All the others who wrote the same word get 1 point for their efforts. This ends the round.
Students add up their points and try another word category.
After a few rounds, the student with the most points wins the game. When you are done, you may wish to go through the students' lists again and check whether any right words remained unsaid or just add a few more anyway. As a rule of thumb, the lower the students' level, the simpler your words should be.