WordCrack

Instructions
Enter the letters in the box at the top (? is wildcard and matches any letter).
Select the shortest word length you wish. The default is 2 and values from 2 through 9 are supported.
Touch the “Search” button to populate a table of results. The app will find all words of size at least the value entered above comprised only of letters entered in step 1 (plus any wild cards). Note that words found are no bigger than the number of letters in step 1
Pressing a row in the table will pass that word to the Internet to search for a definition..
Pressing the Clear button will clear the display.
The words are taken from the public domain word list referred to as Enable2K.