Related Clues:

• Furniture material, sometimes
• Cork source
• Bookshelf wood, perhaps
• Hardwood variety
• Flooring wood
• Sturdy building material
• Cask material
• Bucket material, often
• Squirrel's hangout
• Timber tree
• Mighty tree
• Mature acorn
• Squirrels' hangout
• Maryland emblem
• Symbol of sturdiness