SLIER is a playable word

sly Scrabble® Dictionary

adjective
slier, sliest or slyer, slyest
crafty
(adverb) slyly
35 Playable Words can be made from "SLIER"
   2-Letter Words (7 found)
   3-Letter Words (13 found)
   4-Letter Words (11 found)
   5-Letter Words (4 found)