Corylopsis vs plant genus

Corylopsis and plant genus both are nouns.

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

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

Corylopsis (noun)	plant genus (noun)
small genus of deciduous shrubs of temperate regions of Asia	a genus of plants