BOGGLE
Technically this is more a word game than a vocabulary game, but if you want absolute silence for three minutes, break out the Boggle (you can pick one up at a second-hand store for a buck). Shake the letters up and copy them on the board. Students can go head to head, in groups of four, or in one big free for all. This activity works especially well for students who struggle spelling basic words. Be careful: it's addicting (especially for nerdy English teachers who want to make themselves feel better by crushing children at word games).
VOCABULARY SITUATIONAL ACTING
Put students in groups of 4 or 5. Give them a 3 x 5 card with a specific situation, for example: "you got home late," "your girlfriend caught you with another girl at a party," "you just won an important football game," or "you just soiled yourself trying to solve a math problem." Give them 20 minutes to create a skit effectively utilizing a predetermined number of vocabulary words. You can make it a competition or a film festival with academy awards and popcorn. The grade is based on effective use of words, entertainment value, voice clarity, and individual participation.