class Dicotyledonae vs subclass Asteridae

class Dicotyledonae and subclass Asteridae both are nouns.

Word	Noun	Adjective	Verb	Adverb
class Dicotyledonae	Yes	No	No	No
subclass Asteridae	Yes	No	No	No

class Dicotyledonae (noun)	subclass Asteridae (noun)
comprising seed plants that produce an embryo with paired cotyledons and net-veined leaves; divided into six (not always well distinguished) subclasses (or superorders): Magnoliidae and Hamamelidae (considered primitive), Caryophyllidae (an early and distinctive offshoot), and three more or less advanced groups: Dilleniidae, Rosidae, Asteridae	a group of mostly sympetalous herbs and some trees and shrubs mostly with 2 fused carpels; contains 43 families including Campanulales, Solanaceae, Scrophulariaceae, Labiatae, Verbenaceae, Rubiaceae, Compositae; sometimes classified as a superorder