class Musci vs division Bryophyta

class Musci and division Bryophyta both are nouns.

Word	Noun	Adjective	Verb	Adverb
class Musci	Yes	No	No	No
division Bryophyta	Yes	No	No	No

class Musci (noun)	division Bryophyta (noun)
true mosses: bryophytes having leafy rather than thalloid gametophytes: comprises orders Andreaeales, Bryales, Dicranales, Eubryales, Sphagnales	a division of nonflowering plants characterized by rhizoids rather than true roots and having little or no organized vascular tissue and showing alternation of generations between gamete-bearing forms and spore-bearing forms; comprises true mosses (Bryopsida) and liverworts (Hepaticopsida) and hornworts (Anthoceropsida)