class Angiospermae vs angiosperm

class Angiospermae and angiosperm both are nouns.

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

class Angiospermae (noun)	angiosperm (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)	plants having seeds in a closed ovary