SUBTLEST is a playable word

subtle Scrabble® Dictionary

adjective
subtler, subtlest
so slight as to be difficult to detect
(adverb) subtly
108 Playable Words can be made from "SUBTLEST"
   2-Letter Words (7 found)
   3-Letter Words (23 found)
   6-Letter Words (10 found)
   7-Letter Words (4 found)
   8-Letter Words (1 found)