Category Nuances for polycrystalline_silicon:

• convenient,
• chemical,
• conductive,
• inert,
• crystalline,
• basic,
• elementary,
• conventional,
• expensive,
• stock,
• traditional,
• promising,
• peripheral,
• polycrystalline,

Simple Categories for polycrystalline_silicon:

• material,
• semiconductor,
• silicon,
• contamination,
• substance,