CLUMPER is a playable word

clumper Scrabble® Dictionary

noun
pl. clumpers
a large floating chunk of ice
67 Playable Words can be made from "CLUMPER"
   2-Letter Words (9 found)
   3-Letter Words (24 found)
   5-Letter Words (9 found)
   6-Letter Words (2 found)
   7-Letter Words (2 found)