genus Myosotis vs plant genus

genus Myosotis and plant genus both are nouns.

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

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

genus Myosotis (noun)	plant genus (noun)
forget-me-nots; scorpion grass	a genus of plants