class Monocotyledonae vs liliopsid genus

class Monocotyledonae and liliopsid genus both are nouns.

Word	Noun	Adjective	Verb	Adverb
class Monocotyledonae	Yes	No	No	No
liliopsid genus	Yes	No	No	No

class Monocotyledonae (noun)	liliopsid genus (noun)
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	genus of flowering plants having a single cotyledon (embryonic leaf) in the seed