subclass Dilleniidae vs Parietales

subclass Dilleniidae and Parietales both are nouns.

Word	Noun	Adjective	Verb	Adverb
subclass Dilleniidae	Yes	No	No	No
Parietales	Yes	No	No	No

subclass Dilleniidae (noun)	Parietales (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	a large order of dicotyledonous plants of subclass Dilleniidae