Mother of pearl and Mother-of-pearl

Mother-of-pearl and mother of pearl are semantically related. In some cases you can use "Mother-of-pearl" instead the phrase "Mother of pearl" as a noun or an adjective.

Mother-of-pearl noun - The iridescent internal layer of a mollusk shell.

Mother of pearl and mother-of-pearl are semantically related. Sometimes you can replace phrase "Mother of pearl" with "Mother-of-pearl", this phrases are similar.