Difference between Nacre and Mother-of-pearl

What is the difference between Nacre and Mother-of-pearl?

Nacre as a noun is a pearly substance which lines the interior of many shells, and is most perfect in the mother-of-pearl. while Mother-of-pearl as a noun is the hard pearly inner layer of certain mollusk shells; nacre.

We hope you now know whether to use Nacre or Mother-of-pearl in your sentence.