class Actinozoa vs order Actinaria

class Actinozoa and order Actinaria both are nouns.

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

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