Merriam-Webster: Word Central
Merriam-Webster offers a great site that has several spelling games
that are fun for anyone. Play Alpha-bot, a game with three levels that challenge users' spelling skills. Antonyms, synonyms, and and word usage are featured in the Robo-Bee game. Feed the BIGbot with knowledge of vocabulary as well as your skill with understanding angles. Play Jumble Kids to unscramble words, find the bonus solution, and score big points.