SICKER is a playable word

sick Scrabble® Dictionary

adjective
sicker, sickest
affected with disease or ill health
verb
sicked, sicking, sicks
to sic
57 Playable Words can be made from "SICKER"
   2-Letter Words (6 found)
   3-Letter Words (18 found)
   5-Letter Words (10 found)
   6-Letter Words (2 found)