zoology vs univalve

zoology and univalve both are nouns.

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

zoology (noun)	univalve (noun)
the branch of biology that studies animals	a class of mollusks typically having a one-piece coiled shell and flattened muscular foot with a head bearing stalked eyes
all the animal life in a particular region or period

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