zoological science vs segmental

zoological science is a noun but segmental is not a noun.

Word	Noun	Adjective	Verb	Adverb
zoological science	Yes	No	No	No
segmental	No	Yes	No	No

zoological science (noun)	segmental (noun)
the branch of biology that studies animals

zoological science (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