Naiadales vs class Monocotyledones

Naiadales and class Monocotyledones both are nouns.

Word	Noun	Adjective	Verb	Adverb
Naiadales	Yes	No	No	No
class Monocotyledones	Yes	No	No	No

Naiadales (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