Source: http://lifehacker.com/5534168/word-finder-finds-the-right-word-when-you-draw-a-blank
Word Finder is pretty handy for any situation in which you draw a blank and can't figure out a word—whether you're doing a word jumble, a crossword puzzle, or just can't put your finger on that word that you know is in your head but isn't coming to you. There are a few different search parameters, too; you can define the length of the word, what letters it starts with, ends with, or has somewhere inside it, and even unscramble them. You even get two dictionaries to choose from, one of which is the official Scrabble dictionary (though if you try to whip this out during Scrabble, that probably counts as cheating). Hit the link to check it out, and never wait for the next day's crossword answers again.