Well I have made an online dictionarywww.wordpetal.comBut if you spell a word wrong it doesn't show the definitian obviouslyHow can I add a did you mean... to the search so it spots spelling errors etc...
You can make a little hack - scrape Google search results page for given keyword and search for "Showing results for .....". Then, save these words somewhere so you don't need to scrape G next time. If you dont want to do this, you need to get your own words database somewhere, then perform Levehnstein distance.