nicker⁴ /nikˈər/

1. A clay marble (also knicker)
2. The round seed of a Caesalpinia (or Guilandina if this is considered a separate genus), used for playing marbles (also nickˈar)

• uranology
• uranometries
• uranometry
• uranoplasties
• Unicode
• unicolor
• unicolorate
• unicolorous
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• unicoloured
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• unideal
• unidealism
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• unidealistic
• unidentifiable
• unidentified