genus Aeonium vs plant genus

genus Aeonium and plant genus both are nouns.

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

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

genus Aeonium (noun)	plant genus (noun)
a genus of plants of the family Crassulaceae	a genus of plants