systema nervosum centrale vs encephalon

systema nervosum centrale and encephalon both are nouns.

Word	Noun	Adjective	Verb	Adverb
systema nervosum centrale	Yes	No	No	No
encephalon	Yes	No	No	No

systema nervosum centrale (noun)	encephalon (noun)
the portion of the vertebrate nervous system consisting of the brain and spinal cord	that part of the central nervous system that includes all the higher nervous centers; enclosed within the skull; continuous with the spinal cord