Mezzo-soprano and Singing voice

Mezzo-soprano noun - The female singing voice between contralto and soprano.

Singing voice and mezzo-soprano are semantically related. In some cases you can use "Singing voice" instead a noun phrase "Mezzo-soprano".

Singing voice noun - The musical quality of the voice while singing.

Mezzo-soprano and singing voice are semantically related. Sometimes you can replace phrase "Mezzo-soprano" with "Singing voice", this phrases are similar.