SLITTIEST is a playable word

slitty Scrabble® Dictionary

adjective
slittier, slittiest
being long and narrow
94 Playable Words can be made from "SLITTIEST"
   2-Letter Words (9 found)
   3-Letter Words (21 found)
   6-Letter Words (9 found)
   7-Letter Words (4 found)
   8-Letter Words (3 found)
   9-Letter Words (1 found)