order Casuarinales vs class Dicotyledones

order Casuarinales and class Dicotyledones both are nouns.

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

order Casuarinales (noun)	class Dicotyledones (noun)
order of chiefly Australian trees and shrubs comprising the casuarinas; 1 family: Casuarinaceae	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