genus Bryum vs moss genus

genus Bryum and moss genus both are nouns.

Word	Noun	Adjective	Verb	Adverb
genus Bryum	Yes	No	No	No
moss genus	Yes	No	No	No

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

genus Bryum: type genus of the Bryaceae: mosses distinguished by mostly erect and tufted gametophytes and symmetrical short-necked capsules
moss genus: a genus of mosses

genus Bryum (noun)	moss genus (noun)
type genus of the Bryaceae: mosses distinguished by mostly erect and tufted gametophytes and symmetrical short-necked capsules	a genus of mosses