Hidden inside used sit dues, sued, and used, four-letter plays tied at the top of this rack with 5 points in Scrabble apiece. In all, 11 valid words come out of this rack, grouped by length below and checked for Words With Friends as well as Scrabble.
Unscramble SEUD, SEDU or UDES and you get the same 4 letters as USED: so the words from USED listed below are the words from those scrambles too.
dues, sued, and used tie for the highest Scrabble score from used at 5 points. The top 10 of 11 words are shown here, with the full list organized by length below.
There are 3 four-letter words hiding in used: two come from rearranging its letters, and used itself is already a playable word with no unscrambling required. If a familiar word is all you need, start with sued and used. For points, the strongest plays are dues, sued, and used — each worth 5 points in Scrabble.
25 five-letter words can be made using all the letters in used plus one additional letter.
Swap a single tile in used and you get a different four-letter rack with its own word list. None of these appear in the results above — they share 3 of the 4 letters, not all of them.
used is in the NWL, the official Scrabble word list for North America, and in the Words With Friends dictionary, so it's playable exactly as it stands and needs no unscrambling.
The 1-point gap between the two totals comes from the tile values themselves: Scrabble and Words With Friends price the same letters differently.
Dictionaries record three senses for used. Scrabble and Words With Friends score tiles and not meanings, so every sense below is worth the same 5 points on a Scrabble board:
used is one of three four-letter words the same letters produce. No arrangement of the same tiles scores higher in Scrabble, so playing used unchanged also takes the maximum points these letters offer.
The highest-scoring plays from these letters are dues, sued, and used, worth 5 points in Scrabble, and nothing else built from used earns more points in Scrabble. Words With Friends prices the same letters differently, so the top of the list changes on a Words With Friends board. Both scores count tile values only and exclude premium squares.
The letters in used produce 11 valid words in the Scrabble and Words With Friends dictionaries. The word count by length is: 3 four-letter words, 4 three-letter words and 4 two-letter words.