order Volvocales vs class Chlorophyceae

order Volvocales and class Chlorophyceae both are nouns.

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

order Volvocales (noun)	class Chlorophyceae (noun)
chiefly freshwater green algae; solitary or colonial	algae distinguished chiefly by having flagella and a clear green color, their chlorophyll being masked little if at all by other pigments