The letters in JUSTIFIES make 90 words of two letters or more. The longest is JUSTIFIES at 9 letters, and the highest-scoring is JUSTIFIES at 19 points.
No other single word uses all 9 letters of JUSTIFIES. JUSTIFIES has 9 letters: 4 vowels and 5 consonants, worth 19 points before any board bonuses.
9-letter words 1
7-letter words 1
jesuits14
6-letter words 4
feists9jesuit13suites6tissue6
5-letter words 20
etuis5feist8fests8fetus8fists8fujis15fuses8issei5issue5jests12justs12jutes12seifs8sifts8sites5situs5sties5suets5suite5suits5
4-letter words 29
efts7etui4fess7fest7fets7feus7fist7fits7fuji14fuse7fuss7jess11jest11jets11just11jute11juts11seif7seis4sets4sift7site4sits4sues4suet4suit4ties4tuis4uses4
3-letter words 23
efs6eft6ess3fet6feu6fie6fit6ifs6its3jet10jeu10jus10jut10sei3set3sis3sit3sue3tie3tis3tui3use3uts3
2-letter words 12
ef5es2et2if5is2it2si2ss2ti2ts2us2ut2
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.