class Actinozoa vs order Actiniaria

class Actinozoa and order Actiniaria both are nouns.

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

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