Monocotyledonae vs class Angiospermae

Monocotyledonae and class Angiospermae both are nouns.

Word	Noun	Adjective	Verb	Adverb
Monocotyledonae	Yes	No	No	No
class Angiospermae	Yes	No	No	No

Monocotyledonae (noun)	class Angiospermae (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	comprising flowering plants that produce seeds enclosed in an ovary; in some systems considered a class (Angiospermae) and in others a division (Magnoliophyta or Anthophyta)