genus Zerumbet vs plant genus

genus Zerumbet and plant genus both are nouns.

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

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

genus Zerumbet: perennial rhizomatous herbs of Asia and Australia and Polynesia having ginger-scented rhizomes
plant genus: a genus of plants

genus Zerumbet (noun)	plant genus (noun)
perennial rhizomatous herbs of Asia and Australia and Polynesia having ginger-scented rhizomes	a genus of plants