class Hydrozoa vs Cnidaria

class Hydrozoa and Cnidaria both are nouns.

Word	Noun	Adjective	Verb	Adverb
class Hydrozoa	Yes	No	No	No
Cnidaria	Yes	No	No	No

class Hydrozoa (noun)	Cnidaria (noun)
coelenterates typically having alternation of generations; hydroid phase is usually colonial giving rise to the medusoid phase by budding: hydras and jellyfishes	hydras, polyps, jellyfishes, sea anemones, corals