subclass Rosidae vs rosid dicot genus

subclass Rosidae and rosid dicot genus both are nouns.

Word	Noun	Adjective	Verb	Adverb
subclass Rosidae	Yes	No	No	No
rosid dicot genus	Yes	No	No	No

subclass Rosidae (noun)	rosid dicot genus (noun)
a group of trees and shrubs and herbs mostly with polypetalous flowers; contains 108 families including Rosaceae, Crassulaceae, Myrtaceae, Melastomaceae, Euphorbiaceae, Umbelliferae	a genus of dicotyledonous plants