KARSTS is a playable word

karst Scrabble® Dictionary

noun
pl. karsts
a limestone region
(adjective) karstic
45 Playable Words can be made from "KARSTS"
   2-Letter Words (5 found)
   3-Letter Words (15 found)
   4-Letter Words (15 found)
   5-Letter Words (9 found)
   6-Letter Words (1 found)