Unscrambling TWELVE gives 24 words. TWELVE is the longest, and TWELVE scores the most at 12 points.
No other single word uses all 6 letters of TWELVE. TWELVE has 6 letters: 2 vowels and 4 consonants, worth 12 points before any board bonuses.
6-letter words 1
4-letter words 7
leet4teel4tele4twee7weel7weet7welt7
3-letter words 13
eel3eve6ewe6lee3let3lev6tee3tel3tew6vee6vet6wee6wet6
2-letter words 3
el2et2we5
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.