segmental vs zoology

segmental is not a noun while zoology is a noun.

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

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

segmental (adjective)	zoology (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