Poinciana vs rosid dicot genus

Poinciana and rosid dicot genus both are nouns.

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

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

Poinciana: small subgenus of ornamental tropical shrubs or trees; not recognized in some classifications
rosid dicot genus: a genus of dicotyledonous plants

Poinciana (noun)	rosid dicot genus (noun)
small subgenus of ornamental tropical shrubs or trees; not recognized in some classifications	a genus of dicotyledonous plants