SICKEN is a playable word

sicken Scrabble® Dictionary

verb
sickened, sickening, sickens
to make sick
47 Playable Words can be made from "SICKEN"
   2-Letter Words (7 found)
   3-Letter Words (15 found)
   4-Letter Words (16 found)
   5-Letter Words (8 found)
   6-Letter Words (1 found)