THORN is a playable word

thorn Scrabble® Dictionary

verb
thorned, thorning, thorns
to prick with a thorn (a sharp, rigid projection on a plant)
23 Playable Words can be made from "THORN"
   2-Letter Words (6 found)
   3-Letter Words (12 found)
   4-Letter Words (3 found)
   5-Letter Words (2 found)