genus Anchusa vs plant genus

genus Anchusa and plant genus both are nouns.

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

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

genus Anchusa (noun)	plant genus (noun)
rough and hairy Old World herbs	a genus of plants