class Chlorophyceae vs order Zygnemales

class Chlorophyceae and order Zygnemales both are nouns.

Word	Noun	Adjective	Verb	Adverb
class Chlorophyceae	Yes	No	No	No
order Zygnemales	Yes	No	No	No

class Chlorophyceae (noun)	order Zygnemales (noun)
algae distinguished chiefly by having flagella and a clear green color, their chlorophyll being masked little if at all by other pigments	pond scums; desmids