class Angiospermae vs class Monocotyledones

class Angiospermae and class Monocotyledones both are nouns.

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

class Angiospermae (noun)	class Monocotyledones (noun)
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)	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