SILTIEST is a playable word

silty Scrabble® Dictionary

adjective
siltier, siltiest
full of silt
87 Playable Words can be made from "SILTIEST"
   2-Letter Words (9 found)
   3-Letter Words (21 found)
   6-Letter Words (7 found)
   7-Letter Words (1 found)
   8-Letter Words (2 found)