CAULK is a playable word

caulk Scrabble® Dictionary

verb
caulked, caulking, caulks
to make the seams of a ship watertight
11 Playable Words can be made from "CAULK"
   2-Letter Words (3 found)
   3-Letter Words (3 found)
   4-Letter Words (4 found)
   5-Letter Words (1 found)