ka and ki tie for the highest Scrabble score from kai at 6 points. The top 3 of 3 words are shown here, with the full list organized by length below.
The highest-scoring plays from these letters are ka and ki, worth 6 points in Scrabble, and nothing else built from kai 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 kai produce 3 valid words in the Scrabble and Words With Friends dictionaries. The word count by length is: 3 two-letter words.