scyphozoan vs class Scyphozoa

scyphozoan and class Scyphozoa both are nouns.

Word	Noun	Adjective	Verb	Adverb
scyphozoan	Yes	No	No	No
class Scyphozoa	Yes	No	No	No

scyphozoan (noun)	class Scyphozoa (noun)
any of various usually free-swimming marine coelenterates having a gelatinous medusoid stage as the dominant phase of its life cycle	coelenterates in which the polyp stage is absent or at least inconspicuous: jellyfishes