class Gasteropoda vs univalve

class Gasteropoda and univalve both are nouns.

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

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