Viminaria vs rosid dicot genus

Viminaria and rosid dicot genus both are nouns.

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

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

Viminaria (noun)	rosid dicot genus (noun)
one species: Australian leafless shrubs: swamp oak	a genus of dicotyledonous plants