univalve vs bivalve

univalve and bivalve both are nouns.

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

univalve (noun)	bivalve (noun)
a class of mollusks typically having a one-piece coiled shell and flattened muscular foot with a head bearing stalked eyes	marine or freshwater mollusks having a soft body with platelike gills enclosed within two shells hinged together

univalve (adjective)	bivalve (adjective)
used of mollusks, especially gastropods, as snails etc.	used of mollusks having two shells (as clams etc.)