subclass Dilleniidae vs order Ericales

subclass Dilleniidae and order Ericales both are nouns.

Word	Noun	Adjective	Verb	Adverb
subclass Dilleniidae	Yes	No	No	No
order Ericales	Yes	No	No	No

subclass Dilleniidae (noun)	order Ericales (noun)
a group of families of more or less advanced trees and shrubs and herbs having either polypetalous or gamopetalous corollas and often with ovules attached to the walls of the ovary; contains 69 families including Ericaceae and Cruciferae and Malvaceae; sometimes classified as a superorder	Ericaceae, Clethraceae, Diapensiaceae, Epacridaceae, Lennoaceae, Pyrolaceae, Monotropaceae