Peat moss and Sphagnum

Peat moss noun - Any of various pale or ashy mosses of the genus Sphagnum whose decomposed remains form peat.

Sphagnum is a synonym for peat moss. In some cases you can use "Sphagnum" instead a noun phrase "Peat moss".

Sphagnum noun - Any of various pale or ashy mosses of the genus Sphagnum whose decomposed remains form peat.

Peat moss is a synonym for sphagnum. You can use "Peat moss" instead a noun "Sphagnum".