This is a quick way to revise lots of vocabulary on topics, good for GCSE.
Very simply, you line students up in 2 lines or get them to do it in pairs, up to you. You set the topic, e.g. holidays. Students have to rapidly fire vocabulary, taking turns, without repeating.
If they repeat a word, which is why it is quite good to have you or another student ‘refereeing’, they are out. If they hesitate, the ref counts down from 5, if they haven’t come up with a word by 1, they’re out.
The topic would then change for the next round.
This can be made into a team game, with several rounds, winner stays on, etc.