genus Symphytum vs plant genus

genus Symphytum and plant genus both are nouns.

Word	Noun	Adjective	Verb	Adverb
genus Symphytum	Yes	No	No	No
plant genus	Yes	No	No	No

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

genus Symphytum (noun)	plant genus (noun)
comfrey	a genus of plants