neencephalon vs neoencephalon

neencephalon and neoencephalon both are nouns.

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

As nouns, neencephalon and neoencephalon are synonyms defined as:

neencephalon and neoencephalon: the part of the brain having the most recent phylogenetic origin; the cerebral cortex and related parts

neencephalon (noun)	neoencephalon (noun)
the part of the brain having the most recent phylogenetic origin; the cerebral cortex and related parts	the part of the brain having the most recent phylogenetic origin; the cerebral cortex and related parts