The game "Guess What" can be used for all different ages. How long it lasts depends on the teacher. The main aim of this game is to practice vocabulary in a fun way and therefore connect to the idea of vocabulary learning a positive emotion. 

It works like this: You need 20 little cards (number of cards can be varied, depending on how long it should take). On every card there is a word written down, examples are dangerous, glasses, bridge, to jump and so on. One student starts and gets in front of the others. He or she has now one minute to act out the word from the card. If someone guesses it right, he or she is getting the card and is allowed to keep it. If there is still time left, the person in the front can take the next card with the next word. In the end, everyone has done the acting out part once, so that everyone has had the same chance of guessing. If someone feels that a word is too difficult to act out, they can also try and explain it in English. This also motivates the children to talk a little.
As it is much easier to remember difficult words in connection with a specific image you have in mind, the practice of vocabulary should work quite well. If someone didn't know the English word, they were allowed to ask. But in the end, they all remembered the English word as well. To minimize the chance of someone asking for a translation, you could also put a picture of the word on the card next to the word.