ROCKWOOLS is a playable word

rockwool Scrabble® Dictionary

noun
pl. rockwools
mineral wool used for insulation
85 Playable Words can be made from "ROCKWOOLS"
   2-Letter Words (7 found)
   3-Letter Words (21 found)
   6-Letter Words (2 found)
   7-Letter Words (1 found)
   8-Letter Words (2 found)
   9-Letter Words (1 found)