Related Clues:

• Tree protuberance
• Protuberance
• Tree trunk bulge
• Tree trunk protuberance
• Tree knot
• Bump on a log
• Knot on a tree
• Tree feature
• Lumber feature
• Knot in wood
• Trunk protuberance
• Tree-trunk imperfection
• Wood knot
• A knot or burl in wood
• Bulge in a trunk