class Ophiuroidea vs subclass Ophiurida

class Ophiuroidea and subclass Ophiurida both are nouns.

Word	Noun	Adjective	Verb	Adverb
class Ophiuroidea	Yes	No	No	No
subclass Ophiurida	Yes	No	No	No

class Ophiuroidea (noun)	subclass Ophiurida (noun)
brittle stars and basket stars	brittle stars