KERPLUNK is a playable word

kerplunk Scrabble® Dictionary

verb
kerplunked, kerplunking, kerplunks
to fall or drop with a heavy sound
58 Playable Words can be made from "KERPLUNK"
   2-Letter Words (9 found)
   3-Letter Words (19 found)
   5-Letter Words (4 found)
   6-Letter Words (3 found)
   7-Letter Words (1 found)
   8-Letter Words (1 found)