sphagnum moss vs moss

sphagnum moss and moss both are nouns.

Word	Noun	Adjective	Verb	Adverb
sphagnum moss	Yes	No	No	No
moss	Yes	No	No	No

As nouns, moss is a hypernym of sphagnum moss; that is, moss is a word with a broader meaning than sphagnum moss:

sphagnum moss: any of various pale or ashy mosses of the genus Sphagnum whose decomposed remains form peat
moss: tiny leafy-stemmed flowerless plants

sphagnum moss (noun)	moss (noun)
any of various pale or ashy mosses of the genus Sphagnum whose decomposed remains form peat	tiny leafy-stemmed flowerless plants