Petteria vs rosid dicot genus

Petteria and rosid dicot genus both are nouns.

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

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

Petteria (noun)	rosid dicot genus (noun)
one species: Dalmatian laburnum	a genus of dicotyledonous plants