class Anthozoa vs order Alcyonaria

class Anthozoa and order Alcyonaria both are nouns.

Word	Noun	Adjective	Verb	Adverb
class Anthozoa	Yes	No	No	No
order Alcyonaria	Yes	No	No	No

class Anthozoa (noun)	order Alcyonaria (noun)
a large class of sedentary marine coelenterates that includes sea anemones and corals; the medusoid phase is entirely suppressed	corals and sea anemones having eight branches