This is a word generator robot for games like scrabble. The best helper app in the store.
Internet is not needed.

All you need to do:
-Enter your rack letters in the Letters field, enter '?' for wildcards
-If there are letters that the word must consist, enter them to the rules field, enter '?' for blanks
-You can just enter '?' to the rules section to define the length of words.
-Use arrows to define the position of the consisting letter
-Click generate.

Now you have the list of possible words.

You can sort the words according to score, length, and alphabetically.