encephalon vs neencephalon

encephalon and neencephalon both are nouns.

Word	Noun	Adjective	Verb	Adverb
encephalon	Yes	No	No	No
neencephalon	Yes	No	No	No

encephalon (noun)	neencephalon (noun)
that part of the central nervous system that includes all the higher nervous centers; enclosed within the skull; continuous with the spinal cord	the part of the brain having the most recent phylogenetic origin; the cerebral cortex and related parts