Swietinia vs rosid dicot genus

Swietinia and rosid dicot genus both are nouns.

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

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

Swietinia (noun)	rosid dicot genus (noun)
tropical American mahogany trees	a genus of dicotyledonous plants