bis and sib tie for the highest Scrabble score from sib at 5 points. The top 5 of 5 words are shown here, with the full list organized by length below.
There are 2 three-letter words hiding in sib: one comes from rearranging its letters, and sib itself is already a playable word with no unscrambling required. No common everyday answer stands out among these three-letter results, so let the score decide: the highest-scoring words are bis and sib, each worth 5 points in Scrabble.
Swap a single tile in sib 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.
sib 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 two senses for sib. Scrabble and Words With Friends score tiles and not meanings, so every sense below is worth the same 5 points on a Scrabble board:
sib is one of two three-letter words the same letters produce. No arrangement of the same tiles scores higher in Scrabble, so playing sib unchanged also takes the maximum points these letters offer.
The highest-scoring plays from these letters are bis and sib, worth 5 points in Scrabble, and nothing else built from sib 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 sib produce 5 valid words in the Scrabble and Words With Friends dictionaries. The word count by length is: 2 three-letter words and 3 two-letter words.