Melastoma vs rosid dicot genus

Melastoma and rosid dicot genus both are nouns.

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

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

Melastoma: type genus of Melastomataceae; Asiatic shrubs with leathery leaves and large purple flowers followed by edible fleshy black berries
rosid dicot genus: a genus of dicotyledonous plants

Melastoma (noun)	rosid dicot genus (noun)
type genus of Melastomataceae; Asiatic shrubs with leathery leaves and large purple flowers followed by edible fleshy black berries	a genus of dicotyledonous plants