What It Scores
ISTHMIC is a valid word in the tournament list this site uses. Tile values only, before any premium square: 14 in Scrabble and 15 in Words With Friends. The letters break down as I1 S1 T1 H4 M3 I1 C3.
At seven letters this plays a whole rack, which is a bingo and worth 64 in Scrabble once the 50 point bonus lands.
Words Made From The Letters In ISTHMIC
64 shorter words come out of these tiles. On a board that matters more than the long play, because a short word on a premium square often beats a long one on plain squares.
6 letter words (3)
5 letter words (10)
4 letter words (23)
3 letter words (18)
2 letter words (10)
Next: the Word Unscrambler for any letters at all. Full entry and definition at Merriam-Webster.