Irregular plurals (a game called speedword !)

"You'll be shown 10 words (show/showed/shown = montrer), 1 word every ten seconds. Your task (= tâche) is to use the letter tiles (= utiliser les lettres) to spell out your answer to each one as quickly as possible (= aussi vite que possible).
When you have completed each word -or you run out of time (= ou que le temps est écoulé)-, the next word will appear."

I bet you will enjoy this game because you (mostly boys though) usually like being timed.
I wonder how we could translate "speedword" ? Course aux mots ? I'm not sure...Feel free to help me find the right word.

Good luck ! (bonne chance !)