Category Nuances for nut_shell:

• lighter,
• organic,
• carbonaceous,
• agricultural,
• woody,
• hard,
• diverse,
• raw,
• harsh,
• inert,
• coarse,
• solid,
• dry,

Simple Categories for nut_shell:

• fiber,
• particle,
• residue,
• waste,
• material,
• filler,
• abrasive,
• structure,
• substance,
• precursor,