zoology vs segmental

zoology is a noun but segmental is not a noun.

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

zoology (noun)	segmental (noun)
the branch of biology that studies animals
all the animal life in a particular region or period

zoology (adjective)	segmental (adjective)
	having the body divided into successive metameres or segments, as in earthworms or lobsters
	divided or organized into speech segments or isolable speech sounds