Generate all possible words from specific letters

Hi friends, I wonder what is the best approach to generate words like in this case: WEBSITE ?
The main idea is to generate random words by specific characters and minimum length, and extract all possible correct combinations from specific list of words?

Any ideas or any guidance will be much appreciated!
Thanks in advance!

 

There are two steps to this:

1. Generate all possible permutations - see this answer for more details.
2. Compare all permutations against a dictionary of valid values - e.g. here's one for English