genus Amsinckia vs plant genus

genus Amsinckia and plant genus both are nouns.

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

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

genus Amsinckia (noun)	plant genus (noun)
rough annual herbs of Europe and the Americas: fiddlenecks	a genus of plants