CAULKER is a playable word

caulker Scrabble® Dictionary

noun
pl. caulkers
one that caulks
89 Playable Words can be made from "CAULKER"
   2-Letter Words (8 found)
   3-Letter Words (28 found)
   5-Letter Words (12 found)
   6-Letter Words (4 found)
   7-Letter Words (1 found)