THUNK is a playable word

thunk Scrabble® Dictionary

verb
thunked, thunking, thunks
to make a sudden, muffled sound
12 Playable Words can be made from "THUNK"
   2-Letter Words (4 found)
   3-Letter Words (5 found)
   4-Letter Words (2 found)
   5-Letter Words (1 found)