Top-Ranked Fine-Grained Categories of invar: =>see poetic categories

• alloyed:metal,
• stable:material,
• special:material,
• hard:alloy,
• conductive:material,
• special:alloy,
• robust:material,
• exotic:metal,
• metal:alloy,
• softer:metal,
• metal:substrate,
• iron:alloy,
• catalytic:metal,
• hard:material,
• exotic:material,
• metal:material,
• exotic:alloy,
• suitable:metal,
• stable:metal,
• structural:material,
• refractory:alloy,
• opaque:material,
• special:metal,
• suitable:material,
• stable:alloy,