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Level 21 - RMROTWOO
The answer to this puzzle is:
Words: WORMROOT, MOORWORT, ROOTWORM, MORROW, MORRO, TORR, ROTO, MOOT, MORT, MOOR, ROOM, TORO, WORT, MOW, MOT, MOR, TOR, MOO, ROM, TOM, TOO
Bonus words:
WORMROOT, MOORWORT, ROOTWORM, MORROW, MORRO, TORR, ROTO, MOOT, MORT, MOOR, ROOM, TORO, WORT, MOW, MOT, MOR, TOR, MOO, ROM, TOM, TOO