order Alismales vs class Monocotyledones

order Alismales and class Monocotyledones both are nouns.

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

order Alismales (noun)	class Monocotyledones (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