class Chytridiomycetes vs Chytridiales

class Chytridiomycetes and Chytridiales both are nouns.

Word	Noun	Adjective	Verb	Adverb
class Chytridiomycetes	Yes	No	No	No
Chytridiales	Yes	No	No	No

class Chytridiomycetes (noun)	Chytridiales (noun)
a class of mostly aquatic fungi; saprophytic or parasitic on algae or fungi or plants	simple aquatic fungi mostly saprophytic but some parasitic on higher plants or animals or fresh water fungi; sometimes placed in class Oomycetes