filthy needs no unscrambling at all — the six-letter word is already the strongest play its own letters allow, banking 15 points in Scrabble as it stands. In all, 18 valid words come out of this rack, grouped by length below and checked for Words With Friends as well as Scrabble.
Unscramble HIFLYT, THIFLY or HYLITF and you get the same 6 letters as FILTHY: so the words from FILTHY listed below are the words from those scrambles too.
filthy is the highest-scoring word from filthy, worth 15 points in Scrabble. The top 10 of 18 words are shown here, with the full list organized by length below.
Only one six-letter word uses the letters in filthy — and it is filthy itself. No unscrambling is needed: the word is already playable as written, worth 15 points in Scrabble.
4 seven-letter words can be made using all the letters in filthy plus one additional letter.
Swap a single tile in filthy and you get a different six-letter rack with its own word list. None of these appear in the results above — they share 5 of the 6 letters, not all of them.
filthy 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 filthy. Scrabble and Words With Friends score tiles and not meanings, so every sense below is worth the same 15 points on a Scrabble board:
filthy is the only six-letter word the same letters produce. No arrangement of the same tiles scores higher in Scrabble, so playing filthy unchanged also takes the maximum points these letters offer.
The highest-scoring play from these letters is filthy, worth 15 points in Scrabble, and no other word from filthy 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 filthy produce 18 valid words in the Scrabble and Words With Friends dictionaries. The word count by length is: 1 six-letter word, 2 five-letter words, 3 four-letter words, 7 three-letter words and 5 two-letter words.