subclass Hamamelidae vs Dicotyledones

subclass Hamamelidae and Dicotyledones both are nouns.

Word	Noun	Adjective	Verb	Adverb
subclass Hamamelidae	Yes	No	No	No
Dicotyledones	Yes	No	No	No

subclass Hamamelidae (noun)	Dicotyledones (noun)
a group of chiefly woody plants considered among the most primitive of angiosperms; perianth poorly developed or lacking; flowers often unisexual and often in catkins and often wind pollinated; contains 23 families including the Betulaceae and Fagaceae (includes the Amentiferae); 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