The letters in FINISHING make 40 words of two letters or more. The longest is FINISHING at 9 letters, and the highest-scoring is FINISHING at 16 points.
No other single word uses all 9 letters of FINISHING. FINISHING has 9 letters: 3 vowels and 6 consonants, worth 16 points before any board bonuses.
9-letter words 1
7-letter words 3
finings11fishing14shining11
6-letter words 2
fining10finish12
5-letter words 2
finis8nighs9
4-letter words 15
figs8fins7fish10ghis8gins5hins7hisn7inns4nigh8nisi4shin7sigh8sign5sing5sinh7
3-letter words 10
fig7fin6ghi7gin4hin6his6ifs6inn3ins3sin3
2-letter words 7
gs3hi5if5in2is2sh5si2
Words are from our open word list and include some game-only words. Rude words are left out of this page; the unscrambler shows every valid word, lets you add blank tiles and filter by length.