Curtisia vs rosid dicot genus

Curtisia and rosid dicot genus both are nouns.

Word	Noun	Adjective	Verb	Adverb
Curtisia	Yes	No	No	No
rosid dicot genus	Yes	No	No	No

As nouns, rosid dicot genus is a hypernym of Curtisia; that is, rosid dicot genus is a word with a broader meaning than Curtisia:

Curtisia (noun)	rosid dicot genus (noun)
a large evergreen tree of South Africa	a genus of dicotyledonous plants