Cynoglossum vs plant genus

Cynoglossum and plant genus both are nouns.

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

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

Cynoglossum: a large genus of tall rough herbs belonging to the family Boraginaceae
plant genus: a genus of plants

Cynoglossum (noun)	plant genus (noun)
a large genus of tall rough herbs belonging to the family Boraginaceae	a genus of plants