gastropod vs univalve

gastropod and univalve both are nouns.

Word	Noun	Adjective	Verb	Adverb
gastropod	Yes	No	No	No
univalve	Yes	Yes	No	No

As nouns, gastropod and univalve are synonyms defined as:

gastropod and univalve: a class of mollusks typically having a one-piece coiled shell and flattened muscular foot with a head bearing stalked eyes

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

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