Obviously my first answer would be, what's wrong with a regular dictionary. Then I thought of ways to make it faster for the player so thought about a regular dictionary with the basic value of each word (so you don't have to claculate), you can also show the double and tripple value. Then I thought a better way would be to arrange based on the number of letters so 2 letters words (and then alphabetical order), 3 letters words, etc.