order Ulvales vs class Chlorophyceae

order Ulvales and class Chlorophyceae both are nouns.

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

order Ulvales (noun)	class Chlorophyceae (noun)
an order of protoctist	algae distinguished chiefly by having flagella and a clear green color, their chlorophyll being masked little if at all by other pigments