order Urticales vs class Dicotyledonae

order Urticales and class Dicotyledonae both are nouns.

Word	Noun	Adjective	Verb	Adverb
order Urticales	Yes	No	No	No
class Dicotyledonae	Yes	No	No	No

order Urticales (noun)	class Dicotyledonae (noun)
an order of dicotyledonous plants including Moraceae and Urticaceae and Ulmaceae	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