Came up with this one a bit too late to put it in my new article on the topic, but possibly better than any of the ones that did get in there. Students get one point for each correct statement about other parts of speech of the word on the list that they choose, but lose all their points from that round if they make any incorrect statements. One version also has bonus points for getting all of the forms on the list and guessing which words are most useful.
Academic Word List word formation challenge game
Cambridge First Certificate word formation challenge game
Food vocabulary word formation challenge game
My other word formation games, teaching ideas and assorted photocopiables, including the new article are here:
TEFLtastic 