SOOTHEST is a playable word

sooth Scrabble® Dictionary

adjective
soother, soothest
true
noun
pl. sooths
truth
110 Playable Words can be made from "SOOTHEST"
   2-Letter Words (12 found)
   3-Letter Words (27 found)
   6-Letter Words (7 found)
   7-Letter Words (2 found)
   8-Letter Words (1 found)