MUSHROOM is a playable word

mushroom Scrabble® Dictionary

verb
mushroomed, mushrooming, mushrooms
to grow or spread rapidly
85 Playable Words can be made from "MUSHROOM"
   2-Letter Words (14 found)
   3-Letter Words (29 found)
   5-Letter Words (8 found)
   6-Letter Words (4 found)
   7-Letter Words (1 found)
   8-Letter Words (1 found)