order Alcyonaria vs class Actinozoa

order Alcyonaria and class Actinozoa both are nouns.

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

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