dah and had tie for the highest Scrabble score from dah at 7 points. The top 6 of 6 words are shown here, with the full list organized by length below.
There are 2 three-letter words hiding in dah: one comes from rearranging its letters, and dah itself is already a playable word with no unscrambling required. If a familiar word is all you need, start with had. For points, the strongest plays are dah and had — each worth 7 points in Scrabble.
Swap a single tile in dah and you get a different three-letter rack with its own word list. None of these appear in the results above — they share 2 of the 3 letters, not all of them.
dah 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 one sense for dah. Scrabble and Words With Friends score tiles and not meanings, so every sense below is worth the same 7 points on a Scrabble board:
dah is one of two three-letter words the same letters produce. No arrangement of the same tiles scores higher in Scrabble, so playing dah unchanged also takes the maximum points these letters offer.
The highest-scoring plays from these letters are dah and had, worth 7 points in Scrabble, and nothing else built from dah 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 dah produce 6 valid words in the Scrabble and Words With Friends dictionaries. The word count by length is: 2 three-letter words and 4 two-letter words.