CLONK is a playable word

clonk Scrabble® Dictionary

verb
clonked, clonking, clonks
to make a dull thumping sound
11 Playable Words can be made from "CLONK"
   2-Letter Words (4 found)
   3-Letter Words (2 found)
   4-Letter Words (4 found)
   5-Letter Words (1 found)