class Dicotyledones vs order Rhamnales

class Dicotyledones and order Rhamnales both are nouns.

Word	Noun	Adjective	Verb	Adverb
class Dicotyledones	Yes	No	No	No
order Rhamnales	Yes	No	No	No

class Dicotyledones (noun)	order Rhamnales (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	an order of dicotyledonous plants, containing the families Elaeagnaceae, Leeaceae, Rhamnaceae, and Vitaceae (Rhamnales)