Synonyms for 18-karat gold:

• n.

  •substance (noun)
  • 18-karat gold.

• Other synonyms:

  •n.
  • alloy.
  •Other relevant words:
  • admixture,
  • debase,
  • metal,
  • metallic,
  • metallic element.

Hyponym for 18-karat gold:

• n.

  • substance
    alloy, metal.