segmental vs zoological science

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

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

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

segmental (adjective)	zoological science (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