class Oomycetes vs order Peronosporales

class Oomycetes and order Peronosporales both are nouns.

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

class Oomycetes (noun)	order Peronosporales (noun)
nonphotosynthetic fungi that resemble algae and that reproduce by forming oospores; sometimes classified as protoctists	order of chiefly parasitic lower fungi: Albuginaceae and Peronosporaceae and Pythiaceae