SLUDGING is a playable word

sludge Scrabble® Dictionary

verb
sludged, sludging, sludges
to form sludge (a muddy mass or sediment)
95 Playable Words can be made from "SLUDGING"
   2-Letter Words (9 found)
   3-Letter Words (30 found)
   6-Letter Words (6 found)
   8-Letter Words (1 found)