To make a word with letter the best programme to use is a scrabble solver. A scrabble solver is able to find all 2 to 7 letter words from the letters entered. To do this, type up to 7 letters into the first box and then click 'Find Words' button to find your results. Other online sites that you can use include; Word Pyramid, Word Grid and Crossword Solver.
2 Additional Answers
If you have a given set of letters that you are allowed to use, there are free online generators that can instantly tell you what words can be formed from those letters - for free!
The words that you can make with these letters are the, let, settle, settler, she, he, rest, rests, see, reel, reels, eel, eels, set ,heel ,heels, and sets.