Lingo is a word game developed for Windows Phone 8. The game has a dictionary with a ton of 5 letter words. You'll be given one word to guess and you can do that by writing down a 5 letter word and you'll get feedback with which letters are on the correct spot and which letters are in the word but not on the correct spot. See it as some sort of word version of Mastermind.
For now only you can play by yourself, trying to guess as much words as possible and in the least amount of guesses as possible. Currently working on a multiplayer turn-based version as well.