The letters in QUALITY make 36 words of two letters or more. The longest is QUALITY at 7 letters, and the highest-scoring is QUALITY at 19 points.
No other single word uses all 7 letters of QUALITY. QUALITY has 7 letters: 3 vowels and 4 consonants, worth 19 points before any board bonuses.
7-letter words 1
5-letter words 3
laity8quail14quilt14
4-letter words 8
alit4lati4litu4quai13quay16quit13tail4tali4
3-letter words 12
ail3ait3alt3lat3lay6lit3qat12qua12tau3til3tui3uta3
2-letter words 12
ai2al2at2ay5it2la2li2qi11ta2ti2ut2ya5
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.