SICKEST is a playable word

sick Scrabble® Dictionary

adjective
sicker, sickest
affected with disease or ill health
verb
sicked, sicking, sicks
to sic
79 Playable Words can be made from "SICKEST"
   2-Letter Words (8 found)
   3-Letter Words (21 found)
   6-Letter Words (2 found)
   7-Letter Words (1 found)