genus Arenga vs plant genus

genus Arenga and plant genus both are nouns.

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

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

genus Arenga (noun)	plant genus (noun)
a genus of tropical Asian and Malaysian palm trees	a genus of plants