order Naiadales vs class Monocotyledonae

order Naiadales and class Monocotyledonae both are nouns.

Word	Noun	Adjective	Verb	Adverb
order Naiadales	Yes	No	No	No
class Monocotyledonae	Yes	No	No	No

order Naiadales (noun)	class Monocotyledonae (noun)
an order of aquatic monocotyledonous herbaceous plants	comprising seed plants that produce an embryo with a single cotyledon and parallel-veined leaves: includes grasses and lilies and palms and orchids; divided into four subclasses or superorders: Alismatidae, Arecidae, Commelinidae, and Liliidae