This would be fun if not for 3 things. Word scoring seems completely random. In one game I got half a point for aardvark, my opponent got a "rare" point for anteater. Next time I used anteater, I only got half a point. Another time I used "futon," my opponent got a rare point for "futons." Second, players often cheat by stopping the clock after inserting one word, so you lose because you had 5 seconds to look at the categories. Third, way too many ads, you spend more time watching than playing.
Stop - Categories Word Game at Google Play market analyse