anthozoan vs class Anthozoa

anthozoan and class Anthozoa both are nouns.

Word	Noun	Adjective	Verb	Adverb
anthozoan	Yes	No	No	No
class Anthozoa	Yes	No	No	No

anthozoan (noun)	class Anthozoa (noun)
sessile marine coelenterates including solitary and colonial polyps; the medusoid phase is entirely suppressed	a large class of sedentary marine coelenterates that includes sea anemones and corals; the medusoid phase is entirely suppressed