peat moss vs moss

peat moss and moss both are nouns.

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

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

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

peat 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