class Gastropoda vs univalve

class Gastropoda and univalve both are nouns.

Word	Noun	Adjective	Verb	Adverb
class Gastropoda	Yes	No	No	No
univalve	Yes	Yes	No	No

class Gastropoda (noun)	univalve (noun)
snails and slugs and their relatives	a class of mollusks typically having a one-piece coiled shell and flattened muscular foot with a head bearing stalked eyes

class Gastropoda (adjective)	univalve (adjective)
	used of mollusks, especially gastropods, as snails etc.