class Oomycetes vs order Saprolegniales

class Oomycetes and order Saprolegniales both are nouns.

Word	Noun	Adjective	Verb	Adverb
class Oomycetes	Yes	No	No	No
order Saprolegniales	Yes	No	No	No

class Oomycetes (noun)	order Saprolegniales (noun)
nonphotosynthetic fungi that resemble algae and that reproduce by forming oospores; sometimes classified as protoctists	order of chiefly aquatic fungi