central nervous system vs neuroglia

central nervous system and neuroglia both are nouns.

Word	Noun	Adjective	Verb	Adverb
central nervous system	Yes	No	No	No
neuroglia	Yes	No	No	No

central nervous system (noun)	neuroglia (noun)
the portion of the vertebrate nervous system consisting of the brain and spinal cord	sustentacular tissue that surrounds and supports neurons in the central nervous system; glial and neural cells together compose the tissue of the central nervous system