subclass Magnoliidae vs Magnoliopsida

subclass Magnoliidae and Magnoliopsida both are nouns.

Word	Noun	Adjective	Verb	Adverb
subclass Magnoliidae	Yes	No	No	No
Magnoliopsida	Yes	No	No	No

subclass Magnoliidae (noun)	Magnoliopsida (noun)
a group of families of trees and shrubs and herbs having well-developed perianths and apocarpous ovaries and generally regarded as the most primitive extant flowering plants; contains 36 families including Magnoliaceae and Ranunculaceae; sometimes classified as a superorder	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