order Alismales vs class Monocotyledonae

order Alismales and class Monocotyledonae both are nouns.

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

order Alismales (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